You get the notification by @MojangSupport to move your account to Microsoft. You follow it for your Java edition & now you cannot log in to the game. Your username and password are ALWAYS incorrect. Now unhappy kids & dad. Support passed me to #Microsoft .. what do we reckon?
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Replying to @SPCoulson
If you have trouble launching the game post-migration, remember to use the Microsoft login option & check out this FAQ: msft.it/6016XcyKA! ^FF

Oct 1, 2021 · 9:58 PM UTC

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Replying to @MojangSupport
Yep, done that .. I can log into the website fine, but it doesn't matter which creds I use, Mojang or Microsoft ... nothing works. Same for me and my kids (who's now really worried she's lost all her worlds too!)
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Fix for "Unable to #Login to #Minecraft" on #JavaEdition 1) Check you went through the conversion properly 2) From the log in screen, click "Go Back" 3) Now Add an account 4) Select Microsoft Account 5) Enter your details 6) Call your kids in 7) See their happy smiley faces