A cloud-based identity and access management service for securing user authentication and resource access
Just ran into this issue today. It had to do with entrada MFA enforcement. Go to your entrada MFA security management and disable the enforcement policies for the account used for the AAD sync. I still have legacy MFA enabled no problem and didnt drill down yet to see exactly which policy killed it but that should get anyone experiencing the issue headed in the right direction. I'll post more as I play with it more later (it's late here!).