Registry exclude folder for OneDrive

I am trying to find how I can force OneDrive to exclude a folder under Desktop, that is synced with a third party and can not be moved. There is an extra long path and OneDrive gives an error as such after a period of time. I try to go through the GUI to exclude folder, but OneDrive locks up and I have to close/exit OneDrive . All the files are in OneDrive cache from Desktop and if The Desktop is unchecked from backup then all the files are gone.

My plan is to get Desktop fully synced and not to sync a special folder.

Is there a registry setting to exclude this special folder?