I'm know everything about that, problem is that in new client there is option to host as ( self host ) or by TeamSpeak with 10 slots, but there is no option for me as ATHP's no exist button with options to select the location like Map Hoster, this is a problem what about ATHP's if TeamSpeak GmBH host itself those servers by i3D.net hosting.
https://www.youtube.com/watch?v=b29e4eLG3tM - 0:09 second, why there is no let know users about ATHP's exist. There are many companies why is it not promote? i think no one use the Map Hoster so better build it in the new client teamspeak:
https://teamspeak.com/en/more/find-a-host/