I am going crazy as well, why the GPO is NOT being applied yo usay 'it cannot be linked to other OU's? Calrify please are you saying only one Bilocker GPO per OU, cannot use same GPO for multiple OU's? I have set it to enforced on two OU's it does NOT seem to get applied.
Also get error...
Failed to backup BitLocker Drive Encryption recovery information to Active Directory Domain Services.
Errorcode: 0x80005000
Protector GUID: {724ff397-cae6-4fa9-8291-6dfb87cf286e}
Volume GUID: {0fd29116-955d-4429-8fc5-a9ff41986586}