The server you are trying to access is using an authentication protocol not supported by this version of Office

The server you are trying to access is using an authentication protocol not supported by this version of Office

This error may pop up when you are trying to save a document in Microsoft Teams. What I did to fix this was try saving again, but change the document type from Excel 2000-2003 to just Excel (top choice). It’s most likely an old file and isn’t compatible with 365.

 

 

 

 

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