In Exchange Admin Center, you can do the following to add someone into a mobile mailbox policy.
- In the EAC, click Recipients > Mailboxes and then select a mailbox.
- In the Details pane, scroll to Phone and Voice Features and select View details to display the Mobile Device Details screen.
- The mobile device mailbox policy that’s currently assigned is displayed. To change the mobile device mailbox policy, click Browse.
- Choose the appropriate mobile device mailbox policy from the list, click OK and then click Save.
Or you can run a powershell command in exchange environment.
Set-CASMailbox -Identity firstname.lastname@example.org -ActiveSyncMailboxPolicy "Sales"
To see if a mobile mailbox policy applies to your mailbox, you can run the following command
Get-CASMailbox -Identity email@example.com