So when I ever launch Minecraft and go into a solo world or multiplayer everyone and myself are Steve or Alex. I have been having this problem for a month.
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We're tracking this issue in MC-101579, so this ticket is being resolved and linked as a duplicate.
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This report is a duplicate of MC-101579, which was later resolved as invalid. The reason for this is because this issue is most likely caused by malware or other software that is interfering with Minecraft. Please see the Moderator Note attached to the parent ticket to potentially fix this issue.