Find the VTP primary server on a Cisco switch
"VTP VLAN configuration not allowed when device is in CLIENT mode" means VLANs are managed elsewhere. One show command tells you which switch is the VTP primary.
Notes on security leadership, infrastructure and architecture
"VTP VLAN configuration not allowed when device is in CLIENT mode" means VLANs are managed elsewhere. One show command tells you which switch is the VTP primary.