Is there any way to prod RME into re-synchronizing with DCR? I recall the last time a few devices with messed-up DNS records were entered into DCR, removing them from RME after DNS got fixed did not make RME re-sync with DCR.
To add devices manually from DCR, go to RME > Devices > Device Management > RME Devices. When you click the add button, you will be presented with a list of devices in DCR, but not managed by RME. You can then choose to manage all of those devices in one shot, or pick the devices you want RME to manage.