365 MFA phone call incoming number

Paul Cammarata 1 Reputation point

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 Authenticator
Microsoft Authenticator
A Microsoft app for iOS and Android devices that enables authentication with two-factor verification, phone sign-in, and code generation.
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