I go on My Realm and it says that it is loading, then it closes to the launcher and comes up with a crash message. The message mentions an error log, which I am uploading with this message. This problem has been happening ever since I changed my Minecraft user name about a month ago. Prior to that, everything was working OK.
Duplicate of MC-32606 – If you have not, please use the search function in the future, to see if your bug has already been submitted.
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