I am not sure if "CSE4" is referring to a VM or vApp or if that is just some hardcoded name and of no consequence to the search.

I am asking cause I have just updated CSE to 4.1 and delete the previous vApp/VM (IIRC both called CSE4).

Would be great to have some help with this as I need to remove this instance and reinstall it.

root@PhotonOS-001 [ ~ ]# /mnt/cdrom/linux.run delete instance --name $TMC_SM_INSTANCE_NAME --accept --host $VCD_HOSTNAME --username $VCD_USERNAME --certificate-file /tmp/vcd.pem --encryption-key ${TMC_SM_ENCRYPTION_KEY} --accept --password $VCD_EXT_PASSWORD
INFO [0019] Triggering action action=hook event=PreDelete
INFO [0021] All global roles are ready to delete action=hook event=PreDelete
INFO [0021] cluster:tmc action=hook event=PreDelete
INFO [0021] Get Solution Org action=hook event=PreDelete
INFO [0021] Solution Org: CSE action=hook event=PreDelete
INFO [0021] Search CSE4 Cluster action=hook event=PreDelete
ERROR [0021] Failed to find any cse cluster in org CSE action=hook event=PreDelete
ERROR [0021] Failed to delete instance 'tmc' name=tmc
ERROR [0021] Failed to find any cse cluster in org CSE: exit status 23: failed to execute trigger hook errorCode=5012120012191213