All MCPE installations require an update when trying to play on Realm. But there is no update available - not on iOS, not on Android and not on Windows 10.
Seems to be a massive bug.
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Comments 2
Cleaning up old tickets: This ticket has not been updated recently (1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue, then please comment below and update the ticket description following the Issue Guidelines.
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I can't log in to my realm. Same update message as in attachment.
Others with same issue here: http://www.minecraftforum.net/forums/support/minecraft-windows-10-edition/2772805