The Johan
It's not hiding, but, we have had some problems getting it to work right on Amazon GovCloud. We're in talks with Amazon to track down the problem and try to resolve it.
There is I believe the BYOL version of Access Server available on GovCloud, but not the tiered instances yet. The problem is something to do with meta data of the instances and the licensing system on Amazon. Anyways, as soon as those problems are cleared up, we will launch on GovCloud officially.
In the meantime, BYOL type instances can still be deployed, and if you can't find it, there's always the option of launching a chosen OS like Ubuntu 16 LTS or Ubuntu 18 LTS, and installing our software package on it yourself.