Wasn't sure what version from above, but this is on Xbox One:
If I log into my realm, then 2p picks up controller and signs in so we play splitscreen, if we quit out and then attempt to log back in, my realm does not appear in the menu. The entire Xbox has to be turned off and on, then I log in alone, go into the game itself and then 2p can sign back in.
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In a similar (and probably related vein), my wife 'owns' our edition of MC on Xbox on her gamertag. When I sign in to my home console, I have to sign her in as well to play the game. Very frequently, I will not see my Realms in my list, usually saying Realms is not available.
Restarting the console (full restart, not the sleep mode) usually fixes it until I close the game. Sometimes the restart does not fix the issue.