Sounds like an old bug. make sure you are running at least ATA 1.9 update 2.
ATA Center Directory service account has suspicion of identity theft alert
liban fahad
21
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Eli Ofek (MSFT) 911 Reputation points Microsoft Employee
2020-08-26T15:07:34.473+00:00
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Eli Ofek (MSFT) 911 Reputation points Microsoft Employee
2020-08-26T14:33:47.167+00:00 It depends.
You can read here about what to check and decide if this is benign , false positive or a reason to be worried:
https://learn.microsoft.com/en-us/advanced-threat-analytics/suspicious-activity-guide#suspicion-of-identity-theft-based-on-abnormal-behavior -
liban fahad 21 Reputation points
2020-08-27T07:03:38.593+00:00 Thanks for your support.
I will upgrade the ATA Center and check if it fix.