Symptom
The "Invite" button is disabled with tooltip: "Invites are disabled for your organization."
Solution
Option 1: UI
Settings → Members and roles → General tab → Enable "Allow invites"

Option 2: API
curl -X PATCH "https://<langsmith-host>/api/v1/orgs/current/info" \
-H "x-api-key: <your-api-key>" \
-H "Content-Type: application/json" \
-d '{"invites_enabled": true}'Option 3: SQL (All Organizations at once)
kubectl exec -it <pg-pod> -n <namespace> -- psql -U postgres -d postgres -c "UPDATE organizations SET invites_enabled = TRUE;"