dal69 Said:
"can’t login to macbook air: The so-called apple id for all your apple devices works on my iphone 12! watch, ipad mini 6 but when i use the same password it won’t let me log in. I thought my apple id/password would work on all my devices. Wrong! My macbook air is now useless…i can’t log in at all! Help…"
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Are you stuck at the user Login Screen? If so, perform the following....
Try Resetting your Mac Login Password:
Reset it using the login screen. You'd go through your Apple ID to perform this. Find out more here: If you Forgot your Mac Login Password - Apple Support. Make sure that caps lock is not enabled when typing it.  Does that fix this?