FWIW, Cisco documentation here states that priority tagging is enabled by default:
https://www.cisco.com/c/en/us/td/docs/switches/connectedgrid/cg-switch-sw-master/software/configuration/guide/vlan0/b_vlan_0.html
"Default Settings VLAN 0 priority tagging is enabled by default."
FWIW, Cisco documentation here states that priority tagging is enabled by default:
https:/ /www.cisco. com/c/en/ us/td/docs/ switches/ connectedgrid/ cg-switch- sw-master/ software/ configuration/ guide/vlan0/ b_vlan_ 0.html
"Default Settings
VLAN 0 priority tagging is enabled by default."