Yes I have had this occur as well. I will keep a good look in 1.2.6 update and see if it still occurs.
I experienced this at home with well over 100mbit connection. I believe it has to do with getting the token or whatever from Xbox live. But the server doesn't always pass it properly.
STEPS TAKEN TO FIX PROBLEM:
installing the XBOX app first and signing in there. Then go back to MCPE and choose settings -> profile -> sign out of my account.
Click play again then relogin, if it doesn't work then reboot the phone first, then login the XBOX app again. then go back to the MCPE and it works
Yes I have had this occur as well. I will keep a good look in 1.2.6 update and see if it still occurs.
I experienced this at home with well over 100mbit connection. I believe it has to do with getting the token or whatever from Xbox live. But the server doesn't always pass it properly.
STEPS TAKEN TO FIX PROBLEM:
installing the XBOX app first and signing in there. Then go back to MCPE and choose settings -> profile -> sign out of my account.
Click play again then relogin, if it doesn't work then reboot the phone first, then login the XBOX app again. then go back to the MCPE and it works
UPDATE: Still occurs on 1.2.6 not fixed.