MacBook admin account password reset using Apple ID does not work
Strange... If you wait long enough at the EFI Login Window does the text at the bottom change to say something about restarting into Recovery to reset your password? If so, hold down the power button to shut down then hold it down again to startup in Recovery. Once the Password Reset Utility loads you can choose the My keyboard isn’t working when typing my password to log in option to disable FileVault. It will ask for a password, so not sure it'll work.