Granting editprotected permission to a user group

We are using BlueSpice Free 4.4.2 on MediaWiki 1.39.6

I want to assign the editprotected permission to a Group other than admin. Specifically I want to assign it to the interface-admin Group.

The objective is to allow users to edit MediaWiki/Sidebar WITHOUT having to make them admins

I have added the following to LocalSettings.php:

$wgGroupPermissions[‘interface-admin’][‘editprotected’] = true;

However when I review the permissions for the group, it has none. I think BlueSpice may be overwriting this delegation of permissions.

I can’t use the Custom option when setting up the wiki in the Permissions Manager because Custom is not supported for Free installations.

Please advise.