Microsoft To Do cannot sign in: how to fix login problems

If Microsoft To Do won’t sign you in, the problem is usually one of four things: Microsoft’s sign-in service is having trouble, the app is stuck on cached credentials, you’re using the wrong account type, or something on the device or network is blocking the login flow. The fastest fixes are to check that you’re using the right Microsoft account, confirm your internet connection and Microsoft service status, then update or reset the app so it can start fresh. If the app shows a sign-in loop, fails silently, or errors after your password, the steps below will help you sort out whether it’s the server, the app, or the account itself.

What the sign-in problem usually looks like

The problem usually shows up in one of a few ways: you enter your email and password, the app spins for a moment, and then returns to the sign-in screen; a blank page or white screen appears after you approve the login; or Microsoft To Do shows a message saying it can’t sign you in and the exact message varies.

Sometimes the app seems to accept your password, but your lists never load. Other times it signs in on one device and refuses on another, which usually means the account is fine and the app or device is the part that needs attention.

The exact message varies

This usually appears right after you enter your password, approve MFA, or wait for the app to finish loading your lists.

Which accounts can actually sign in to Microsoft To Do

Before you start:

• This applies to Microsoft To Do on Windows, iPhone, and Android, plus the web version when you’re checking whether the account itself is the problem.
• You usually do not need administrator rights for the first checks.
• Restarting the device is not required at first.
• No backup is needed unless you plan to clear app data on mobile or reset the app on Windows.
• Safe checks to try first: confirm the account email, try the web version, and check Microsoft service status.

Microsoft To Do works best with a Microsoft personal account, like Outlook.com, Hotmail, Live, or an account created directly with Microsoft. Work and school accounts can also sign in in many organizations, but only if your company or school allows Microsoft To Do and the needed Microsoft 365 services are enabled for you.

A wrong account type is a common cause of sign-in trouble. For example, you may be trying to use a personal account in a work-only tenant, or a work account that has been blocked from the app by policy. If you have both a personal and a work account on the same device, make sure you choose the one that actually owns your To Do lists.

If you’re not sure which account should work, try signing in on the web version first. If the web version works with one account but not the other, you’ve found the account that To Do expects.

Try these fixes in order

Use the safest checks first. You usually do not need to reinstall the app right away.

1. Check Microsoft service status.

Where to act: any browser on any device.

Privilege: none.

Microsoft service status page

Open Microsoft’s service status page and look for alerts tied to Microsoft To Do, Microsoft 365, or sign-in services. If there’s an outage, the fix is to wait; retrying over and over usually won’t help.

Expected result: no sign-in outage or incident affecting the service.

If that did not happen, move on.

2. Confirm your internet connection and remove obvious blockers.

Where to act: the device where Microsoft To Do will not sign in.

Privilege: none.

Device settings for Wi-Fi, VPN, proxy, date, and time

Try a different network if you can, or temporarily turn off a VPN, proxy, or privacy filter that might interfere with Microsoft login pages. Also make sure your device date and time are correct, since a wrong clock can break sign-in tokens.

Expected result: the app reaches the sign-in page normally and keeps moving through the login flow.

If sign-in still loops or fails silently, continue.

3. Sign out of Microsoft To Do and sign in again with the right account.

Where to act: inside Microsoft To Do.

Privilege: none.

Microsoft To Do > Profile or account menu > Sign out

Sign out if that option is available, then close the app fully and reopen it. Sign back in using the exact account that owns your lists.

Expected result: the app accepts the chosen account and loads your lists.

If it keeps choosing the wrong account, the saved sign-in state is probably stale.

4. Update Microsoft To Do.

Where to act: the app store on your device.

Privilege: none.

iPhone or Android: App Store or Google Play
Windows: Microsoft Store

Install any available update. If you’re on Windows, update from the Microsoft Store. If you’re on iPhone or Android, update from the App Store or Google Play.

Expected result: the app opens with the latest sign-in components and no longer gets stuck on the login page.

If updating does not change anything, clear the app’s broken cache.

5. Clear the app cache or reset the app.

Where to act: Windows settings or your mobile device settings.

Privilege: none for mobile; some Windows settings changes may require permission.

On mobile, clearing app data can remove local offline data, so only do that if you’re comfortable with that tradeoff.

Settings > Apps > Installed apps > Microsoft To Do > Advanced options > Repair or Reset

On Windows, use the app’s repair option first because it tries to fix the app without removing its data. If Repair does not help, use Reset. On mobile, clear the app’s storage or cache if your device offers that choice.

Expected result: the app starts with a clean sign-in state.

If it still will not sign in, remove the account entry and add it again.

6. Remove the account from the device and add it back.

Where to act: the app or device account list.

Privilege: none for most users, though work or school devices may require policy approval.

Device settings or account settings > Accounts > Microsoft account > Remove, then Add account

Remove the Microsoft account from the device or app account list, then add it again from scratch. The exact path depends on the platform, but the goal is the same: clear the broken account entry so To Do can create a fresh sign-in session.

Expected result: the app creates a new login session and keeps you signed in.

If you use a work or school account, your organization may require you to re-authenticate through a company sign-in page or device compliance check. If that fails, the issue may be policy-based rather than app-based.

How to tell the sign-in problem is solved

You know the fix worked when Microsoft To Do opens to your lists without bouncing you back to the sign-in screen, and your tasks appear normally instead of showing an empty view. A healthy sign-in should also sync changes across devices: add a task on one device, wait a moment, and check that it appears on another.

Expected result: the same account stays signed in, your lists load, and a new task syncs to another device.

If the app loads but only some lists appear, that usually means you signed into the wrong account or the sync has not finished yet. Check the account name or email shown in the profile area and confirm it matches the account that owns your tasks.

If you still get asked to sign in again after every app launch, the login is not sticking. That usually points to cached credentials, a sign-in policy issue, or a problem with the device’s browser component that To Do uses for authentication.

What to do if it still won’t let you in

If the usual fixes fail, the next best move is to isolate the failure point. Start by trying the web version of Microsoft To Do in a browser. If the web version works but the app does not, the problem is local to the app or device. If the web version also fails, the account, password, or organization policy is more likely to be the cause.

MFA can also block sign-in in a quiet way. If your account uses multi-factor authentication, make sure the prompt, authenticator app, SMS, or phone call is actually reaching you. A delayed or stuck MFA prompt can look like a sign-in loop.

Stale cached credentials are another common cause, especially on Windows. If your browser or system keeps offering an old account, clear saved Microsoft sign-in data from the browser and try again. Also check your device clock, since an incorrect time or time zone can make Microsoft login tokens look invalid.

For work or school accounts, your organization may have disabled Microsoft To Do, required device registration, or blocked the sign-in from unmanaged devices. If the web version fails with a policy-style message, the fix may need your IT admin rather than another app reset.

Conclusion

If Microsoft To Do still refuses to sign in after these checks, use the web version to separate an app problem from an account problem, then work from there. If the web version also fails, focus on the account, MFA, or organization policy; if the web version works, stick with the app reset and device-side fixes until the login holds.

Frequently Asked Questions

Can I use Microsoft To Do with a work or school account?

Often yes, but only if your organization allows it. If the account is blocked by policy or the service is turned off for your tenant, sign-in can fail even when the password is correct.

Why does Microsoft To Do keep looping back to the sign-in screen?

That usually means the app can’t keep the authentication session. Cached credentials, a bad app update, the wrong account type, or a browser component problem are the usual causes.

What if my password is correct but sign-in still fails?

Then the password is probably not the issue. Check MFA, account type, device time and date, cached credentials, and whether the Microsoft service itself is having trouble.

How do I know I’m signed into the right account?

Check the email or profile name shown in the app after sign-in, and compare it with the account that owns your lists. If your tasks show up on the web but not in the app, you may be signed into the wrong account or the app has stale data.