CS2 clan tags: how to set one, where it shows, and how servers disable it

[ice]

Quick summary
Counter-Strike 2 lets you show a clan tag next to your name. The tag comes from the Steam Community Group you belong to, you set it on your player profile, and it shows up in death notices. A custom server can turn it off.

Where the tag comes from
The tag is tied to Steam Community Group membership. Valve added the ability to set a clan tag in the September 22 update, and you change it from your player profile.

Where it shows
Death notices. Valve added clan tags to death notices in the September 23 update, so the tag appears when a player is killed.

Turning it off on a server
The September 25 update added the sv_clantags_enabled option so a custom server can disable clan tags. If a server you play on shows no tags, that is the setting the operator used.

FAQ

Do I need to be in a Steam group?
Yes. The tag comes from Steam Community Group membership, and you pick it from your player profile.

Why do some servers show no clan tags?
The server operator can disable them with sv_clantags_enabled.

Where do I change my tag?
On your player profile.

Sources
Valve: Counter-Strike 2 update notes