If you are using Microsoft To Do and see the message "It looks like a firewall is preventing your data from syncing. Try contacting your admin", 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
and the following ports enabled:
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443
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80
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587
If you are seeing similar login issues with other Office 365 web services, please follow these instructions.
