diff --git a/csaxs_bec/bec_ipython_client/plugins/omny/omny.py b/csaxs_bec/bec_ipython_client/plugins/omny/omny.py
index a11c7bce..0ff2437a 100644
--- a/csaxs_bec/bec_ipython_client/plugins/omny/omny.py
+++ b/csaxs_bec/bec_ipython_client/plugins/omny/omny.py
@@ -44,9 +44,11 @@ class OMNYError(Exception):
 
 # BEC accounts (bec.active_account, e.g. "e12345") allowed to select advanced tomo
 # modes (golden ratio, 4/8 sub-tomogram) in OMNY.tomo_parameters(). Regular users only
-# ever see "1: 2 equally spaced sub-tomograms". Populate with real beamline-staff
-# account codes -- left empty until populated, so nobody sees the advanced options yet.
-_SUPERUSER_ACCOUNTS: frozenset[str] = frozenset({})
+# ever see "1: 2 equally spaced sub-tomograms". active_account is a Redis-backed
+# pgroup value, set explicitly via `bec-set-account <pgroup>` -- it is NOT derived
+# from the OS login, so testing as this account requires running
+# `bec-set-account gac-x01dc` first (or wiring pgroup "gac-x01dc" some other way).
+_SUPERUSER_ACCOUNTS: frozenset[str] = frozenset({"gac-x01dc"})
 
 
 class OMNYInitStagesMixin: