What could be a possible reason for issues in syncing between Azure AD and on-premises AD?

A possible reason for issues in syncing between Azure Active Directory (Azure AD) and on-premises Active Directory (AD) is that password writeback is not enabled. Password writeback is a feature that allows users to reset their passwords in Azure AD and have those changes reflected back to the on-premises AD. If this feature is not enabled, any password changes made in Azure AD will not sync back to the on-premises environment, leading to discrepancies.

By having password writeback enabled, organizations can maintain consistency across their user identities in both cloud and local environments, ensuring that authentication processes work seamlessly. This is especially crucial for environments where users need to access on-premises resources after changing their passwords in the cloud. Without this functionality, the synchronization process becomes problematic, and users might encounter login issues or experience confusion regarding their credentials.

While insufficient network bandwidth, complexity of user passwords, and high latency in a region can affect the overall user experience or performance of synchronization, they do not relate directly to the aspect of syncing password changes between the two environments, making password writeback the key factor in this context.