Hello,
It would not be enough to just remove the old folder redirection policy.
What you can try is to:
Launch Group Policy Management on one of your domain controllers and find the policy that defines your current folder redirection settings. Right click on the policy and click on Edit
Go to User Configuration -> Policies -> Windows Settings -> Folder Redirection
Right-Click on each of the folders and click properties
In the Target Tab, make sure Setting is set to Basic – Redirect everyone’s folder to the same location
Under Target folder location make sure its set to Redirect to the local userprofile location
Under the Settings tab, make sure that Redirect the folder back to the local user profile location when policy is removed. is selected.
Click Ok
At this point, you’ll want to go to the computer that is having the issue (in my case all of them) and open a command prompt to issue the gpupdate /force command. You’ll most likely be requested to log off and back on, go ahead and do that.
Back in Group Policy Management, remove the GPO (group policy object) from the OU, you can delete it from the list of Group Policy Objects too if you want, we won’t need it anymore.
Now you’ll want to open a command prompt and run gpupdate /force just one more time. If you are asked to log off and back on, go ahead with that.
You should now be able to right-click on OneDrive and click Settings and go to the Backup tab and click on Manage backup. Now the Start protection button should be enabled and all is good.
Also, please confirm if the value of this registry key is disabled (1=true, 0=false)
HKCU > Software > Microsoft > Windows > CurrentVersion > Policies > Explorer
DisablePersonalDirChange = (1)
And just a small tip: do not try this on the whole OU, use a user or two for testing purposes before implementing the solution on the entire OU.