Hi Kassiani,
What do you mean sign in Skype for Business through Microsoft 365?
Does this issue persist all the time? Or what do you do before this issue happened?
Does anyone else have the same issue?
You can use the Microsoft Remote Connectivity Analyzer to test your environment:
https://testconnectivity.microsoft.com/ first.
Then, check your network connection status by this link:
https://support.microsoft.com/en-us/help/4027616/windows-check-your-network-connection-status.
Moreover, this article gives a few simple methods to check your current network connectivity for reference:
https://www.wikihow.com/See-Active-Network-Connections-(Windows).
Note: Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety,
or suitability of any software or information found there. Please make sure that you completely understand the risk before retrieving any suggestions from the above link.
Best Regards,
Sharon Zhao
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