Stripped-User-Domain case insensitive

Hi, I'am testing Freeradius with this guide <https://wiki.freeradius.org/guide/eduroam>, but when I put a capital letter in my domain name (example: anonymous@mydomain.COm), the requests are proxied. I think I need to add something here (into site-enabled/default) : ... if (Stripped-User-Domain != "${operator_name}") { ... I tested : ... if ("%{tolower:Stripped-User-Domain}" != "${operator_name}") { ... but it doesn't work (all requests are proxied). what wrong? thanks.