Did you ever find the solution to this? I am having the same problem, and I believe we are using the exact same quicksheet that is causing the problem (I am also a vendor for this company).
"Error while sending request to server (768-unknown)"
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I am currently using the 64-bit excel on Mac. I require a login to access some of the excel functionalities. The error states: "Error while sending request to server 768-unknown". This is a Mac problem. This login function works perfectly on Windows. Is there a setting I can adjust on Mac to prevent this error?
Microsoft 365 and Office | Install, redeem, activate | For business | MacOS
Microsoft 365 and Office | Install, redeem, activate | For business | MacOS
Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Microsoft 365 and Office | Excel | For business | Windows
Microsoft 365 and Office | Excel | For business | Windows
A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data