People just assume that, but it's not true. If you have access to your Microsoft account, then you'll have access to your Microsoft passkeys in the cloud.

Passkeys are just passwords that require a password manager. You can login to Microsoft with a Microsoft passkey, but that's not the only way to login to your Microsoft account. You can still login to Microsoft with a password.

All password managers require just one last password outside the password manager to access your account. That's how Microsoft's password manager works, too, and that's why you'll always be able to use a password to login to your Microsoft account.

(If you're afraid of Microsoft banning you from your Microsoft account, then don't use Microsoft's password manager. Bitwarden is pretty good.)