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365 MFA phone call incoming number

Paul Cammarata 1 Reputation point
2021-02-12T14:42:18.943+00:00

We have a user the utilizes the phone call method to verify his login to 365. He stated that the calls typically come from 855-330-8653, but recently have started coming in from a second number occasionally. I would like to know if there is a list of number I can get that the calls should be coming from?

Microsoft Security | Microsoft Authenticator
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