Replying to @StrawMode
That likely means you're not signing in with the correct credentials! Please make sure you're logging in using the right account and check this FAQ if you need further help: help.minecraft.net/hc/en-us/… ^BT

Dec 5, 2022 · 7:37 PM UTC

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Replying to @MojangSupport
You probably have to migrate your acount and thats why it isnt working