fix old call

src/pretix/api/serializers/organizer.py

@@ -58,7 +58,7 @@ from pretix.helpers.permission_migration import (
     OLD_TO_NEW_EVENT_COMPAT, OLD_TO_NEW_EVENT_MIGRATION,
     OLD_TO_NEW_ORGANIZER_COMPAT, OLD_TO_NEW_ORGANIZER_MIGRATION,
 )
-from pretix.helpers.urls import build_absolute_uri
+from pretix.helpers.urls import mainreverse_absolute
 from pretix.multidomain.urlreverse import eventreverse_absolute
 
 logger = logging.getLogger(__name__)
@@ -499,7 +499,7 @@ class TeamInviteSerializer(serializers.ModelSerializer):
                 'user': self,
                 'organizer': self.context['organizer'].name,
                 'team': instance.team.name,
-                'url': build_absolute_uri('control:auth.invite', kwargs={
+                'url': mainreverse_absolute('control:auth.invite', kwargs={
                     'token': instance.token
                 })
             },