Yes I have two tuners on board. My account name is thebroadster, with dual subscription. I am using mdapi. Not at home at the moment but I can send the logs when I am.
Server has registered 2 simultaneous connections from your IP. 1 (one) emulator (ACamd in your case) - shall give you 1 connection per both tuners. Only 1 emulator shall be launched. If your software does not allow launching 1 emulator for both tuners, you have to set it up corerctly. If you cannot set it up properly, you need to buy 2 separate subscriptions with different logins and passwords (2 accounts).
This is warning from Moderator: if you cannot change this situation, buy second login, otherwise server will ban you.