Edit: Just realised its a common issue, so no real stress
So as soon as i click the realms button (from the main menu) it comes up with:
Invalid session
Please try restarting Minecraft
I've restarted, logged out and signed back in no luck. I'm not sure if this is a realms problem, or if my files have randomly corrupted or something else, but please get this patched or let me know how this can be fixed.
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We're tracking this issue in MC-198546, so this ticket is being resolved and linked as a duplicate.
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