Hello Andrei,
I'm Chaps, a fellow Microsoft user and an independent Advisor here to help you.
Microsoft Account password requirements:
Passwords must have at least 8 characters
Passwords must contain at least two of the following: uppercase letters, lowercase letters, numbers, and symbols
Password can’t contain the part of your email address that comes before the @ sign (existing requirement)
Hope this helps. Keep safe!
Kind regards,
Chaps