I have a MacBook Air (M1) model and the localadmin account is locked. This account is the only one on the computer with admin rights. It does have a teacher (mobile) account and the teacher can sign in. It is connected to an AD server. This computer is running Big Sur and was not upgrade from a previous macOS. [br]
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I did restart computer and tried SMC which it didn't work. I tried to invoke Recovery and that didn't work either. [br]
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I did wait the 24 hour period and it is still local admin account is still locked.