The placeholder virtual machine on the recovery site still exists after you delete the protection group and recovery plan

When you delete the recovery plan and protection group from the
Site Recovery Manager
inventory, the placeholder VM might still be visible on the recovery site.
When you delete the recovery plan and protection group from the
Site Recovery Manager
inventory, the placeholder VM is still visible on the recovery site. An error occurs when you try to create a new protection group with the same datastore and virtual machine. When you try to manually delete the placeholder virtual machine from the
vCenter Server
inventory, an error occurs.
Site Recovery Manager
marks the virtual machine as orphaned.
Delete the placeholder virtual machine and remove the orphaned virtual machine, then create the protection group with the same virtual machine.