Please try the troubleshooting in the help article linked below for the "Unable to connect to server" error.
What do I do if I am disconnected on Xbox One with the error message "Unable to Connect to Server. Please Check Your Internet Connection"?
If you still receive this error after troubleshooting, please contact customer support to open a ticket.
NewBlacksmurf wrote: »Been this way prior to the maintenance in terms of the exact error message for over 12 months.
Its more frequent and not a result of not using xbox support suggestions like...hard reset and deleting save, or deleting gamertag from console and adding back.
Did not do a complete reinstall however I did do so last month after the last update.
ISP Google Fiber
NA Server
Wired connection today also try wireless which seems more stable oddly
NAT Open
no issues in other xbox live games or services.
Issue exists on two different Xbox One consoles in the same consistent manner.