Azure AD SCIM attributes

Anyone familiar with this?
I tried to add custom Zoom attributes within AzureAD with “zoomPhoneNumber” and “urn:ietf:params:scim:schemas:extension:zoom:1.0:User:zoomPhoneNumber” but neither of them worked.

Do I need some further schema editing because it seems like the AzureAD app doesn’t know the endpoint “urn:ietf:params:scim:schemas:extension:zoom:1.0:User” to update zoom phone attributes?