Hello everyone,
I'm working in IT Support in a corporate environment, and we're experiencing recurring Excel saving issues affecting multiple users.
Environment:
Microsoft Excel: Excel 2016 (desktop application).
File storage: Shared folders and files accessed through SharePoint or OneDrive.
Scope: Multiple users are affected intermittently. The issue does not occur for everyone at the same time.
Problem description:
When users open and edit Excel workbooks stored in shared locations, Excel displays the following warning:
"UPLOAD FAILED – You need to sign in to upload your changes to this location."
A Microsoft sign-in window also appears with messages such as:
"We couldn't find an account with that email address or phone number."
"There was a network problem. Please try again later."
These errors prevent users from reliably saving their changes to the original shared files.
We've noticed that these incidents have become increasingly frequent, resulting in more IT support tickets related to Excel saving problems.
Questions:
What could cause these recurring upload and authentication errors in Excel 2016 when working with SharePoint or OneDrive?
Could this be related to cached credentials, Office authentication, OneDrive synchronization, or Microsoft 365 configuration?
Since multiple users are affected intermittently, could this indicate an issue with the shared environment rather than individual computers?
What troubleshooting steps would you recommend to identify the root cause?
Are there any known compatibility issues between Excel 2016 and modern SharePoint/OneDrive authentication mechanisms that could explain this behavior?
We want to identify the root cause rather than repeatedly applying workarounds to individual computers.
Thank you for your help.