Managing personal Outlook.com account settings, security, and privacy
There is no need to remember your passwords anymore. Easy-to-remember passwords may not be the most secure. Your browser can save passwords, and so can a password manager. I also strongly suggest you jot down or print out a complicated password and hide it in a safe place, in case you are asked to enter it when a password manager fails to autofill it.
With passkeys, all you need to remember is your PIN if you choose that option. Your credentials are stored on a chip on your computer or on a portable security key if you have set one up. With passwords, you have no stored credentials of your own, just a word that may be floating around on the web somewhere. I compare passkeys to an ATM card with a PIN. With passwords, you only have a PIN.
Perhaps you can use your password, or part of it, as your PIN? How about trying that?