Follow these steps to clean up Risk Auth server instances:
1. Connect to Risk Auth database.
2. Run below query to remove RA instance:
delete from arrfinstances where HOSTNAME='<Host_Name>';
3. Run below query to remove the protocol entries associated with that instance:
delete from ARRFPROTOCOLREGISTRY where INSTANCEID like '<Host_Name>';
3. Restart application server and Strong Auth services after committing these transactions.