> ## Content Index > Fetch the complete content index at: https://todayfixtech.com/llms.txt > Use this file to discover other available public pages before exploring further. # Microsoft Loop known issues and how to fix them - URL: https://todayfixtech.com/microsoft-loop-known-issues/ - Published: 2026-11-02T10:24:21.000Z - Updated: 2026-11-02T10:24:21.000Z - Author: Md Sojib Mia - Tags: Troubleshooting [If Microsoft Loop won’t](https://todayfixtech.com/fix-microsoft-365-login-issues/) open, won’t sync, or coauthoring stalls, the cause is usually an account/tenant policy, a local client/browser state problem, or a network/conditional-access restriction. Start with quick, reversible fixes (sign out/in, update, clear cache), then check licensing and tenant controls, and collect diagnostics if the problem persists. The sections below list symptoms, step-by-step fixes with exact commands and settings paths, how to verify a fix, and what to gather for support. ## Why Loop won’t open or signs it’s broken ```text App won’t start: clicking Loop opens then closes or nothing happens. ``` Symptom When it appears: immediate on launch; no UI or the window flashes. ```text Blank panels or error tile: you can open Loop, but pages show empty canvas or "Something went wrong". ``` Symptom When it appears: after sign-in or when loading a specific page/component. ```text Sync stalled or edits not visible to others. ``` Symptom When it appears: changes remain local, or you see a sync spinner or an "offline" indicator. [Coauthoring updates lag or](https://todayfixtech.com/microsoft-365-updates-features/) never arrive. ```text Specific error messages: you see permission or service errors. ``` Symptom When it appears: during access, saving, or when trying to open a component shared by others. How to identify quickly: - Try Loop in a different client: web, Teams, and desktop. If one works and another doesn’t, the issue is local to that client. - Test with a different account (guest or test) if allowed; if that account works, it’s an account or permission problem. - Check basic network reachability: if other sites load but Loop fails, suspect firewall, proxy/TLS inspection, or conditional access blocking real-time connections. ![A laptop screen briefly flashing then closing the Microsoft Loop window, captured mid-crash with the app window fading.](https://tse1.mm.bing.net/th?q=laptop%20with%20Microsoft%20Loop%20app%20crashing%20window%20photo&w=624&h=352&c=7) ## Is Loop supported for my account and environment Product/versions this applies to: - Microsoft Loop app (Windows, Mac), Loop components inside Teams/Outlook, and Loop in modern browsers. Privileges needed: - Admin checks require Global Administrator or a delegated admin role. Local client fixes usually need the user account; local admin is required only for cache delete or reinstall. Restart, backup, and safety: - Restarting the client or browser is safe and recommended before deeper steps. - Back up or export any visible unsynced content before removing accounts, clearing profile folders, or reinstalling. Safe checks to do first: - Confirm the user has an appropriate Microsoft 365 license that includes Loop features. - Confirm tenant settings do not block Loop or Fluid services. Steps for admins to check common controls: 1. Verify license assignment. ```powershell Connect-MsolService Get-MsolUser -UserPrincipalName user@tenant.com | Select DisplayName, Licenses ``` PowerShell (run as Administrator) Expected result: the user has an assigned license that includes Loop capabilities. If not, assign the correct SKU. 1. Check Microsoft 365 service status in the admin center. ```text Microsoft 365 admin center > Health > Service health ``` Settings path Expected result: no active incidents affecting Loop or Fluid services. If there is an incident, [follow Microsoft guidance and](https://todayfixtech.com/fix-onedrive-slow-performance/) avoid client-side resets until it clears. 1. Review tenant-level service settings that affect Loop (SharePoint, OneDrive, Fluid). ```text Microsoft 365 admin center > Settings > Org settings > Services > Microsoft Loop / Fluid (if present) ``` Settings path Expected result: Loop/Fluid is enabled for the tenant. If the setting is missing or disabled, you must engage tenant admins or Microsoft support. 1. Check Conditional Access and device compliance policies. ```text Azure AD > Security > Conditional Access > Policies ``` Settings path Expected result: no policy blocks Loop clients or web endpoints. If a policy blocks the client, create an exclusion or adjust the policy to allow the required client apps and trusted locations. If any of the above checks fail, fix the license or tenant policy before continuing with client-side troubleshooting. ## Quick fixes that resolve most issues Start here. These are reversible, low-risk steps in the order to try them. 1. Sign out and sign back in (client and browser). ```text Loop app > Account menu > Sign out ``` Settings path Expected result: the client gets fresh tokens and transient auth errors often clear. If you receive an auth error, that points back to identity or Conditional Access. 1. Update the app or browser to the latest version. ```text Windows: Microsoft Store or app > Help > Check for updates Browser: Browser menu > Help > About ``` Settings path Expected result: the client runs the current build. If the update fails, the installer or browser update logs indicate why. 1. Clear client cache (safe, reversible). Close the Loop app before clearing files. ```text Windows cache path: %localappdata%\Microsoft\Loop\Cache Mac path: ~/Library/Application Support/Microsoft/Loop/Cache ``` Settings path Expected result: corrupted cache is removed and the app recreates fresh cache. If content is still missing after cache clear, verify server-side copies exist before proceeding. 1. Browser-specific: clear site storage for Loop or use an InPrivate/Incognito window. ```text Browser > Settings > Privacy > Clear browsing data > Site permissions > Clear data for loop.office.com ``` Settings path Expected result: fixes corrupted IndexedDB or site storage. If the problem persists, try a different browser profile. 1. Check Microsoft 365 service status and restart clients. ```text Microsoft 365 admin center > Health > Service health ``` Settings path Expected result: no active service incident. If there is an incident, wait or follow Microsoft guidance instead of making major client changes. 1. Remove and re-add account (last-resort client profile reset). Removing an account from the app can delete locally cached edits that were not uploaded. Export or copy visible content and confirm server-side copies before removing an account. ```text Loop app > Account > Remove account ``` Settings path Expected result: a fresh profile is created on sign-in. If unsynced edits are lost, collect logs and open a support case for recovery. ## When sync or coauthoring fails — targeted fixes Triage: determine whether the issue affects all users or a subset, and whether it affects specific pages or components. 1. Confirm network access to Loop/Fluid endpoints. ```powershell Test-NetConnection loop.office.com -Port 443 ``` PowerShell (run as Administrator) Expected result: TCP 443 connects. If it fails, investigate firewall or proxy rules blocking outbound HTTPS. 1. Check Conditional Access policies that may block specific browsers or client apps. ```text Azure AD > Security > Conditional Access > Policies ``` Settings path Expected result: the policy grants access for the user’s client. If not, add an exception for Loop endpoints or the app. 1. Inspect proxy and TLS interception appliances. - If a corporate proxy uses TLS inspection, it can break WebSocket or long-lived connections used by Loop. Temporarily whitelist `loop.office.com` and related domains or bypass TLS inspection for those hosts and retest. 1. Large page or heavy component troubleshooting. - If a Loop page contains many embedded files or very large items, split the content into smaller pages. 1. Copy the critical content into a new, smaller Loop page and test sync. 2. Move suspect components to their own pages and test each one. Expected result: smaller pages sync reliably. If splitting doesn’t help, collect logs and escalate. 1. Coauthoring latency: test on a clean network and a different client. - If coauthoring works in the web client but not the desktop app, clear the desktop app cache or reinstall as a last resort. 1. Temporary measures for persistent sync errors. - Export critical content to a supported file type (Word, OneNote, or markdown) or copy it to OneDrive/SharePoint until the sync issue is fixed. If these targeted fixes fail, collect diagnostics and open a Microsoft support case as described below. ## How to verify the problem is resolved and collect logs Verify fixes by reproducing the failing action and collecting evidence if it still fails. Test actions to confirm a fix: 1. Open the affected Loop page and create a small visible change (add a line of text) and confirm it appears in another client or browser within a minute. 2. Sign in from a second device or browser and confirm you see the change. ```text Change appears immediately or within a few seconds in the second client; no sync spinner or offline indicator. ``` Expected output What to gather for support: - Screenshot of the error or blank page with URL and timestamp. - Exact error text if shown (the exact message varies). - Client logs: Loop desktop logs (Windows Event Viewer or app logs) and browser console/network logs. How to capture browser network trace and console: 1. Reproduce the issue with the browser open. 2. Open DevTools > Network and Console, reproduce the error, then export a HAR and copy console output. How to run a Fiddler or network capture: 1. Start Fiddler (or an equivalent capture tool) on the client machine. 2. Reproduce the issue while the capture runs. 3. Stop capture and save the session file. ```text Fiddler: File > Save > Session Archive (.saz) ``` Settings path What to include in a support case: - Account UPNs affected, timestamps (UTC), exact error messages (the exact message varies), HAR or Fiddler capture, client logs, and steps to reproduce. Note any recent tenant policy or Conditional Access changes. Do not upload traces with sensitive content to public forums. Provide them directly to Microsoft support through the secure upload link in the support case. ## Known bugs, workarounds and Microsoft links I won’t list version-specific bug IDs because they change; below are recurring issue types and practical workarounds. Common issue types and recommended workarounds: - Intermittent edit loss or delayed coauthoring: split large pages, reduce embedded content, or fall back to OneDrive/SharePoint files until the Loop issue is fixed. - Desktop app not opening while web works: use the web client and clear the desktop app cache. If that fails, reinstall the app as a last resort after exporting unsynced content. - Conditional Access blocking real-time connections: create policy exceptions or allow the necessary endpoints and client app IDs. - Browser IndexedDB corruption: clear site storage for `loop.office.com` or use a different browser profile. Where to check official Microsoft information: - Use the Microsoft 365 admin center Service health for incidents and the Microsoft 365 message center for planned changes. - For release notes and documented Loop issues, search Microsoft documentation and the Microsoft support portal for Loop, Fluid, or Loop components. Microsoft updates Loop behavior and endpoints over time; confirm the current required endpoints in Microsoft documentation before changing firewall rules. ## Conclusion If quick fixes (sign out/in, update, clear cache) don’t restore Loop, check licensing and Conditional Access next. For persistent sync or coauthoring failures, collect HAR/Fiddler traces, client logs and exact error text, then open a Microsoft support case. Meanwhile, use the web client or export critical content to OneDrive/SharePoint as a temporary measure. ## Frequently Asked Questions ### What endpoints and ports does Loop need open on my firewall? Loop uses HTTPS (port 443) and real-time mechanisms that rely on WebSocket-style connections. Whitelist \`loop.office.com\` and Microsoft 365 endpoints required by SharePoint/OneDrive and Fluid. Check Microsoft’s network connectivity documentation for the current endpoint list before changing firewall rules. ### Will reinstalling the Loop app delete unsynced edits? Removing or reinstalling the app can delete locally cached data that wasn’t uploaded. Before reinstalling, export or copy any visible content, confirm server-side copies exist, and collect logs. Treat reinstall as a last resort. ### Why does Loop work in the browser but not in Teams? If Loop works in a browser but fails in Teams, the issue is client-specific (the Teams client or Teams embedded Loop experience) or a Teams app policy. Test Teams desktop vs web, clear the Teams cache, and check Teams app permission policies in the Teams admin center.