Microsoft
MicrosoftVern_Bateman , please stay tuned. We are doing some internal testing and developing clearer documentation for Configuration Manager users, hopefully I can share that here soon.
In the meantime... here are some things we know (probably not new to you either) that can help:
1) I think that using Domain Group Policy for the SetPolicyDrivenUpdateSourceForDriverUpdates policy may be the key to ensuring this value stays set the way you expect when only wanting to move Drivers to Intune, and leave other update types in Configuration Manager.
2) We think most people having trouble are trying to use #1 above... moving the Windows Updates co-management slider to Intune is more likely to work... though if you only want drivers, you can set the other SetPolicyDrivenUpdateSources* back to WSUS using Settings Catalog. We are going to validate this as well.
Note that MDMoverGP doesn't apply for Windows Updates policies... it's counter-intuitive, and has been that way for a long time, so changing it now would be pretty impactful to anyone depending on the current behavior.
I hope that helps a bit today, and I'll bring more specific details as soon as we have them.
-David