Hello F N,
Welcome to Microsoft Q&A forum.
Before we proceed further, can you please try to sign in to the Microsoft website using incognito or InPrivate tabs first? Please let me know how it goes.
In the meantime, you can try this quick fix to see if it helps.
- Type "Credentials Manager" in the search bar and press Enter.
- Go to "Windows credentials"
- Remove all entries:
- Contains "Xbl"
- Contain Mojang.
- Related to the affected account.
- Restart your computer.
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