MacBook Air password not recognized; invalid email for reset

If you forgot your Mac login password - Apple Support describes the applicable steps, even if you didn't actually forget the password. Methodically follow the steps in that document, omitting nothing, all the way to the end.

If you reach the end and are prompted to enter your Apple Account information, but it does not recognize the email address associated with your Apple Account, then If you forgot your Apple Account primary email address or phone number - Apple Support is applicable.

• You needed that Apple Account email address to log into this website, otherwise you would not have been able to post your question here. If you created a brand new Apple Account to do that, don't use it for that Mac because it won't work. That Mac needs the Apple Account you used to set up that Mac.