The VM VNIC's adapter, associated with a vSwitch or VDS port group, failed with the error: "Port group" could not be found.
VMware vSphere ESXi 7.x
VMware vSphere ESXi 8.x
This is expected behavior: if a VM is moved to an ESXi host that lacks a port group with the exact same name, it will not connect.
Create a port group with an identical name, then assign the VM's vNIC adapter to it.