Microsoft Authenticator App - Is there a limit to multiple users(15) accessing the same mailbox authenticating through the App

Dave Ryan 1 Reputation point

We have 15 users who require access to a single mailbox - Each user has their own mailbox which is 2Factored and they also monitor an additional mailbox where permissions have been delegated. The additional mailbox is not 2 factored and is not a shared mailbox, we have kept it as a regular mailbox.

Is there any limit to how many people can use the App against the same mailbox? There must be an easier way...


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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  1. 2020-12-08T18:42:27.95+00:00

    Hello @Dave Ryan , the Authenticator App is not used directly against or by a mailbox or SAAS (EG: Outlook) but in tandem with an Identity Provider. In the case of Office for business the provider would be Azure AD. Any limit regarding access to the same mailbox would need to be imposed in the mailbox service (EG: Outlook/Exchange).

    Please let me know if you need more help. If the answer was helpful to you, please accept it and, optionally, provide feedback so that other members in the community can benefit from it.

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