Every time I try and change my skin into my custom made skin, it keeps changing it back to the Alex skin when I join or create a world. (The game mode doesnt really matter)
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Same as you, It keeps saying it worked but im alex.

It only works in multiplayer.
Thank you for your report!
We're tracking this issue in MC-101579, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as invalid, which means this is a technical support issue. Please take a look at the parent ticket (MC-101579) and see if a solution is provided there.
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This looks to be a duplicate ofΒ MC-101579, which was later marked as Invalid. The reason for this is because the problem that you are experiencing here, is caused by malware interfering with Minecraft. Please read the Moderator Note on the duplicated link for instructions on how to solve this problem. If this does not fix the issue, please contactΒ Community Support, as the bug tracker does not have the appropriate resources to provide you with assistance.