Replying to @ajaishdb
This can sometimes happen if you're logged in with the wrong Microsoft account. Please try logging in with a different Microsoft account, just in case it was migrated somewhere else on accident. I usually recommend trying the same email that you used for your Mojang account. ^NS

Dec 10, 2021 · 5:33 PM UTC

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Replying to @MojangSupport
Only one Microsoft account was used. I believe that the process was interrupted when I updated my Microsoft account information. Afterwards, the account failed to migrate, but it was still deleted which is why I can’t log in normally on the Mojang website.
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To keep your information secure, please complete our request form at msft.it/6018ZDk1o so we can quickly and safely assist with your question! ^FF
Replying to @MojangSupport
Hello, I only had one Microsoft account on my computer, and that’s the one I used. There is no account to where the mojang account could’ve been migrated to.
Replying to @MojangSupport
I never got an email saying the migration was complete. As I was migrating the mojang account, my existing Microsoft account asked me to update my phone info, so I did. After I updated it, I couldn’t go back to the migrating page. Then I couldn’t log back in to my mojang account.