Dear CMD_5,
Thank you for posting to Microsoft Community. We are happy to assist you.
ased on the description you have shared; we understand that It's important to know the type of account you're using, because each account has a different process and a different support category. However, to better understand the problem and provide a solution, we need more details from you, please provide us with the following information. Thank you.
1-Please, can I know the type of the affected account? Is it IMAP, POP or exchange account?
Sometime you can have some issue like External email accounts cannot communicate with the IMAP server, plus an off-the-wall pop-up appears quite often: Microsoft "Add a Service". An error message within that pop-up says my email account can't be found. So let me know if it is the issue.
2-Please may i know the domain provider? 3- Is it happen for all user or one user? it can be also temporally issue
4-Please let me know if you are in hybrid environment?
5-Check if the user's domain account is locked out or has any issues with authentication. You can do this by logging into the domain controller and checking the event logs.
- Try resetting the user's domain account password and see check the issue.
- Check if there are any group policies or security settings that could be causing the pop-up to appear. You can do this by running the Group Policy Results wizard on the user's computer.
We look forward to your reply. This requested information will help us narrow down the scenario and find the right troubleshooting. We will continue to assist you based on the information you provide. I sincerely appreciate your patience and cooperation.
Sincerely,
Libeamlak | Microsoft Community Moderator