I missed something?
GetAccess.cfg is server-sided, it only defines if you can get requested access level. In short, it's a replacement of access entries in FOnlineServer.cfg
GMTbuttons.txt is client-sided, it only defines how your menu will look like
after server give you an access. It must be in root client directory, just where .exe is.
As you noticed, there's zero warning messages if you do something wrong - i didn't want to give players any hints that whole thing even exists