There are several types of error messages you might encounter in Microsoft To Do.
This may be due to your network connection. Using a VPN, proxy, or firewall could cause sync issues with To Do. Contact your IT admin to have these URLs approved:
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.microsoft.com
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.msecnd.net
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.live.com
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graph.windows.net
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graph.microsoft.com
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.office.com
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.office.net
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.office365.com
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static2.sharepointonline.com
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todo-web-endpoint.azureedge.net
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.microsoftonline.com
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.microsoft.io
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.windows.net
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microsoft-my.sharepoint.com
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microsoft.sharepoint.com
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login.microsoftonline.com
Make sure your IT admin also turns on these ports:
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443
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80
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587
If you're trying to sign in to Microsoft To Do on the web and see a 503 error, this could be related to limitations in the local network or restrictions on a corporate network.
Check with your IT admin to make sure none of these URLs are blocked:
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.microsoft.com
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.msecnd.net
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.live.com
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graph.windows.net
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graph.microsoft.com
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.office.com
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.office.net
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.office365.com
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static2.sharepointonline.com
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todo-web-endpoint.azureedge.net
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.microsoftonline.com
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.microsoft.io
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.windows.net
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microsoft-my.sharepoint.com
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microsoft.sharepoint.com
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login.microsoftonline.com
Please follow the steps mentioned below to fix the error:
Mac users:
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Uninstall the To Do app
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Open Finder
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Press CMD+Shift+G and enter ~/Library/Group Containers/UBF8T346G9.com.microsoft.to-do-mac/AccountData/userdatabase.db
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Delete this file
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Download the To Do app from the App Store again
iOS users:
Reinstall the To Do app from the App Store
