How to Hide AD Mobile Number Field to be visiable on Office 365

Question

Hi There,

We have enabled VPN & MFA for our Office 365 users (Synced with local AD). Just wondering if there is to hide their mobile number on GAL so nobody can see a user's mobile number? Currently on Outlook, I can see every internal users Mobile Number.

Thanks,
ML

Answer 1

You should let the users configure their MFA phone details themselves - this will populate the authenticationphone attribute, which is not exposed in the GAL.

Answer 2

@Mang Lai

As michev said, the phone that saw in Outlook are different from the phone that used for MFA. Here is a detailed information for you:
The phone number that you see in Outlook is controlled by Office photo in Azure AD.

The photo number that used for MFA is controlled by and manage from another place:

So, if you don't want to show photo in Address List, you need to remove Office photo and Mobile photo from Azure AD, it doesn't effect the using of MFA. (This modify action need take a long time to sync from Azure AD to Exchange online then to Outlook client. It took almost 1 hour in my environment)

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Answer 3

Curious if you can segment population of employees that it does feed from Azure AD and others that do not? Or, is it all or nothing? Essentially, is there role or job type permissions that can be set for it to sync - think mobile reimbursement as part of role/salary employee vs. hourly employees/no reimbursement?? I'm not the technical resource, but trying to solve the problem with an alternative option so want facts around capabilities or methods to be able to do it.