​Dynamics 365 Online leverages Azure AD fields to import information to users, e.g.:
- First Name;
- Last Name;
- Job Title;
- Address
And, depending on your configuration, these Azure AD fields might be coming directly from on-premises Active Directory (AD), which means that any changes made in AD will go through all the way to Dynamics 365 Online!
That also means that if you change a field in Dynamics 365 directly, that might get overwritten by the value in Azure AD in the next sync (usually every 15-30 minutes), so make sure you make that field read-only so users are not led to error.
Recommended fields to keep as read-only in Dynamics 365:
- User Name;
- Title (Job Title);
- Address
You can find more information on official Microsoft documentation: https://community.dynamics.com/crm/f/microsoft-dynamics-crm-forum/386022/info-azure-active-directory-attributes-that-are-synced-to-dynamics-365-cds
(The above content comes from this article.)