Forum Discussion
error enabling Unified Messaging - number already registered
Using skype for business 2015 with exchange online. Getting the following error when attempting to enable voicemail for a specific user. "The phone number you entered has already been register...
Hi Brian
This will be indicating a duplicate number within Exchange Online and not Skype for Business on-premises.
http://jackstromberg.com/2014/01/office-365-the-phone-number-you-entered-has-already-been-registered-by-someone-else/
Regards
Andrew J. Price
Yep! Exactly what Andrew said