I have upgraded a customer’s AD Connect to the new version just release – with the feature of Device Write back gone from preview to GA. (remember Device back is a AzureAD premium feature)

https://azure.microsoft.com/da-dk/documentation/articles/active-directory-aadconnect-version-history/

The device write back was enable as this guide descripted https://azure.microsoft.com/da-dk/documentation/articles/active-directory-aadconnect-get-started-custom-device-writeback/

The only problem was that it was not working 😦

The devices came from AzureAD to the AD Connect database but not into the local AD – after some search for errors with Microsoft Support the solutions was found.

The solutions was to run a “Refresh directory schema”

And now it works 🙂