Hi,
Before going further, I would appreciate your help in clarifying the following situations:
Does this occur to other apps in these PCs?
Please try the following steps:
Update the PCs to the latest build: Download Windows 10
Check Internet connection: Fix network connection issues in Windows 10
Also refer to this detailed troubleshoot methods:
https://appuals.com/fix-office-365-no-internet-connection-error/
Best regards.
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