Caller ID issues with skype for business online

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Hey all, one of our users (at least we think it is only one) is having issues with caller ID, note that we use skype for business/O365 online.


For example: When he calls me I see his proper skype/office # on  the caller ID because he is calling me from his skype for business account....but if I miss the call, I do get an email notification....but in the details it shows as if the call came from his mobile #.


Any idea where the issue could be?


I did notice something in the desktop client settings...under Options - Phones, I do see his office and mobile #s listed, but am unable to change the mobile# because the "Mobile Phone" button is greyed out (see attached image)

I found this article that said its an admin setting, but I can't find it anywhere...again, not sure if this is the cause but figured I would mention it.

https://support.office.com/en-us/article/change-my-phone-number-for-skype-for-business-20e03cc1-c023-4e5d-bafd-064ddb59ed5e?ui=en-US&rs=en-US&ad=US


Thoughts??
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Commented:
Fixed by removing the mobile# is AzureAD and updating the local GAL

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