Hi,
Details for the error should be visible in vCenter Server Tasks page, when you hover over the status of the failed task.
Please check the failed recovery task at the secondary site vCenter Server and also if there are failed tasks at primary site vCenter Server.
VRMS logs at /opt/vmware/hms/logs/ at the VR appliances should also contain details.
If the error details are not self-explanatory, please open an SR for further assistance.
Regards,
Martin