.vmx fails to register in vCenter or host inventory, adding it to the inventory will show up as invalid with the full path to the .vmx.
A file lock is being held on the VM.
Determine the file lock owner:vmfsfilelockinfo -p /link/to/vmx -v <vCenterIP/FQDN> -u administrator@vsphere.local
Remove the lock
Additional resources:
Virtual machines appear as invalid or orphaned or inaccessible.