What is the first action to take if user objects are missing attributes after maintenance on an Azure VM domain controller?

Booting into Directory Services Restore Mode (DSRM) is the correct first action to take when user objects are missing attributes after maintenance on an Azure VM domain controller. This mode allows you to access the Active Directory database in a safe environment without interference from other services.

In DSRM, you can perform critical recovery operations, including repairing or restoring the Active Directory database. This is particularly essential when you suspect a corruption or issue that occurred during maintenance, allowing you to investigate and potentially resolve the missing attributes.

Running the Active Directory Replication Status Tool might help identify replication issues, but it wouldn't directly address missing attributes. Resetting user accounts could be a last resort but doesn't resolve underlying issues with the directory. Restoring from a backup is also a viable option but is more time-consuming and may not be necessary if the issue can be fixed in DSRM. Thus, entering DSRM is the most immediate and effective action to take in this scenario.