@Jeff Schwefler Thanks Julia. I might have had a small success with this.
1. Open One Drive Settings
2. Go to the Settings Tab
3. Uncheck "Save space and download files as you use them".

After I did this and rebooted the One Drive folder showed up in the wizard and the backup ran successfully.

HTH
Scott

Me too. Folder definitely exists, but CB can't see it. Doesn't matter if run as Admin or regular user.
We've been backing this folder up for years with no problem so either something in Windows has changed or something in CB has changed. Or both I guess....
I've created a ticket: 75375