Vern_Bateman I'm in the same boat as you, trying to get this working for co-managed clients for Drivers only with the updates workload still set to ConfigMgr. After a week of playing about with policies in GPO and Intune I've got drivers showing for review but like you nothing seems to be appearing on my target devices once I approve them.
David_Guyer Similarly to Vern I'll eagerly await the findings from your internal testing and some official docs for this scenario. One setting in particular I'd like some clarity on, that I've seen mentioned in some of the community articles I've found is DisableWindowsUpdateAccess=0 being a requirement. This setting seems to allow a standard user to click the button to 'Check online for updates from Microsoft Update' and the device immediately pulls down a bunch of unapproved drivers. It proves the policy driven update source is working correctly as I only see drivers offered but obviously that's a gap I'll need to ensure is closed before I can think about using this in production.
Thanks