Hi,
Thanks for posting in Q&A platform.
May I know if the domain name was set up automatically? If yes, please try to set the domain name up manually to see if the issue still existed.
Here is a similar thread discussed before, you could have a look:
Anywhere Access shows that the Domain name is not set up for my server
And for more details regarding anywhere access, please refer to the following article:
Manage Remote Web Access in Windows Server Essentials
Best Regards,
Sunny
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