Symptoms:
VMware Site Recovery Manager 8.x
The issue is caused if the host or host cluster listed under SRM resource mapping is not part of VDS
To resolve this issue, add the host to VDS in SRM. For more information, see the Add Hosts to a vSphere Distributed Switch section in the vSphere Networking Guide.
NOTE: Ensure network mapping is configured properly and reverse mapping is checked to perform failbacks.