We have just upgraded the minecraft bedrock server running on windows 10 to 1.16...
Our Xbox users all got the update automatically and couldnt connect to the old version (1.14) so i took the chance to upgrade our servers...
However now the Xbox users get a message :

"You don't currently have a strong connection to the server"

clicking connect anyway times out... Nothing has changed on our customers xboxs - as far as they are aware, and other than upgrading the servers on windows 10, nothing has changed here...
i am able to connect on my windows 10 gaming lappy both internally on our network and externally on various networks....

So please can someone explain how to fix the xbox users ability to connect.
Many thanks