Use https://units.arma3.com/ to display clan tag after your name, have the unit selected from launcher or ingame settings and join a server

1. example: tag is showing up on the left when player has selected role in a mission but on the right on the list of players it is not.
2. example: Clan tag does show up in the player list when in map screen/mission
3. example: clan tag is not showing up on shacktac hud or vanilla huds

Tag is showing up consistently when using squad.xml. Also tested on vanilla endgame servers