If you modify on-prem, have you confirmed that it's modified checking Entra Connect and the audit logs in Entra?
Mobile Number not syncing in Hybrid AD
Hybrid AD setup and everything except for Mobile Number is syncing.
In Microsoft Admin center the field for Mobile Number is editable, but it isn't saving changes and just says "Retry not possible"
Any idea what is causing this?
2 answers
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Akhilesh Vallamkonda 13,060 Reputation points Microsoft External Staff
2025-01-13T19:59:42.19+00:00 Hi @Jeffery Tingle
Thank you for reaching Microsoft Q&A Forum!
I understand that you have a Hybrid AD setup, and you have noticed the mobile number is not syncing.
May I know which users you are trying to update the mobile number is the user is created in cloud or the on-premises AD?
May I know is this issue is happening with one particular user or all the users in the directory?
IF you are trying to update the mobile number for on-premises AD user this is expected behavior. Because there is no write back feature, you need to update the phone number in the on-premises AD, and this will sync to Entra ID directory.
If you have updated the phone number in the on-premises AD and the phone number attribute is unable to sync to Entra ID, you can refer to the following articles on how to troubleshoot synchronization issue.
Troubleshoot an attribute not synchronizing in Microsoft Entra Connect
End-to-end troubleshooting of Microsoft Entra Connect objects and attributes
Troubleshoot object synchronization with Microsoft Entra Connect Sync.
IF you are trying to update the mobile number for cloud user, may I know you have enough permissions to edit the attributes? may I know which roles is assigned to you?
If the issue has persisted, please check the logs and see if you find any errors. Also please do share the error screen shots what you see while updating the phone number.Hope this helps. Do let us know if you any further queries by responding in the comments section.