You may receive an 'Unable to reset SSO' error during the attempted removal request in Fleet Manager.
One or more of the VIDB nodes has been manually deleted/removed from the cluster.
You may receive an 'Unable to find VM' error if one of the nodes has been manually deleted.
Environment
VCF Operations 9.x
Resolution
Start a delete VIDB environment request in Fleet Manager and select 'skip task' if the request fails on the task to reset the SSO or you receive the 'unable to find VM' error during the delete environment request.