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Comments on excel : "unknown user"

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mslove
Occasional Visitor

Hi,

 

When I write a comment on excel online, it's written "unknown user" instead of my name. Why ? How can I change it ? And if I share a document with other persons, cant I notify them inside the comment (for instance : "@oliver blabla ...") ? I don't find the answer on internet unfortunately.

Thanks for your help.

Best.