If you are using Microsoft To Do at https://to-do.microsoft.com and see the message “We’re having trouble syncing your data. Contact support for more info”, this may be due to your network connection. Using a VPN, proxy or firewall could cause issues syncing with To Do.
Please contact your IT Admin to have the following URLs whitelisted:
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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
If you are seeing similar login issues with other Office 365 web services, please follow these instructions.
If the issue continues after whitelisting those addresses and does not seem to be related to your network connection, please send us a message.
