In that case, you may have luck having the realm owner remove you from the realm and re-add you?
I managed to fix this issue- I downloaded and installed Minecraft PE on an android device (not rooted), downloaded a copy of the Realm. Then I installed a third party savegame modifying app (I used PocketInvEditor -no root required), and modified my player's coordinates to something significantly different from what was there. I then entered the game SUCCESSFULLY, but was out of bounds from the map. Being out of bounds, I died almost instantly, spawning back in the normal worldspawn coordinates. Then I saved the game, and replaced the world on my Realm with this modified savegame. Now I am back playing in my Realm normally.
For this to work you must have the game set to survival mode- if in creative mode you can't be hurt so your only option would be to enable cheats and teleport to usable coordinates. Also I believe the game must be saved to "external" on Minecraft PE for the PocketInvEditor to find it and modify it.
I had the same issue. iPhone 7 Plus, running iOS 11.0.3 and Minecraft PE v1.2.3, the device timed out and the screen locked during the end credits, now I cannot join my own realm, it just closes the app and kicks me back to my home screen as it is loading the realm. I’ve uninstalled and reinstalled the app, no joy.
Apple TV 4th generation model A1625, tvOS 11.0
Minecraft Apple TV Edition Version 1.1.5 (last updated 8/7/2017)
same issue. Have deleted all iCloud data for the app and deleted the app, rebooted Apple TV and reinstalled the app, XBOX Live signin is still broken and just flashes a message about connecting to XBL. Never able to actually sign in.
edit: Issue seems specific to Apple TV Edition, I am able to sign into Pocket Edition on my iPhone running iOS 11.0.1 with no issues.
+1 bought this forsaken version, bought it also for desktop, iOS, and android. My kids get so frustrated that this doesn't work right on the apple tv, it's really pathetic that one of the most expensive versions is the least supported.