Hi @Mi1an , please perform the following steps and let me know if it resolves your issue:
- Restart the Azure AD Connect Sync service on the machine where the AD Connect is installed.
- Check the connector's permissions: make sure the account you are using is an admin with the highest possible permissions on premises, and is a member of the enterprise admin group in your AAD and has the reset password permissions that are required for the password writeback to work.
- Ensure Network Connectivity. Check if the following addresses are allowed for outbound HTTPS access:
- Disable and re-enable the password writeback option from the Azure AD Connect Configuration wizard
If this answer helped you please mark it as "Verified" so other users may reference it.