Running 1.14. Due to the VLAN configuration of these switches being.... unique, I'm having a hard time getting a VLAN to work properly.

VLAN 1 should be untagged everywhere.
VLAN 12 should be tagged on ports 1 and 4.
The other VLANs are irrelevant at this time.

What's wrong in my configuration?

Running 1.14. Due to the VLAN configuration of these switches being.... unique, I'm having a hard time getting a VLAN to work properly.

VLAN 1 should be untagged everywhere.
VLAN 12 should be tagged on ports 1 and 4.
The other VLANs are irrelevant at this time.

What's wrong in my configuration?

well,
for V1 untagged on all ports:
ports 2,3,5 - on vlan tab -> vlan mode "strict", default vlan ID 1. on vlans tab -> 1 vlan "always strip" for other vlans - "not a member"

for V12 tagged on 1,4 and untagged for 2,3,5
on Vlan tab - enabled and default vlan - 1(which gives V1 untagged), on vlans tab - for both vlans - "leave as is" (sometimes (depends on other hw) works "with add if missing")