This issue is specific to Apple iTunes backup encryption and is not covered in the provided Windows or Microsoft account password/reset documentation.
References:
- Change or reset your password in Windows
- I can't sign in to my Microsoft account
- Reset a forgotten Microsoft account password
- Can't sign in to my email - Microsoft Q&A
- My Microsoft account is blocked. - Microsoft Q&A
- I need to speak with a real person and it seems impossible. - Microsoft Q&A
- BellSouth Email Login Issues? How to Reset My Password - Microsoft Q&A
- Cannot Access Microsoft Account After Hacker Changed Email, Advice Needed - Microsoft Q&A