There are a few errors with the GCCHigh Huntress App Registration powershell script. The first is that the Connect-AzureAD command needs the "-Environment AzureUSGovernment" to connect to a govcloud tenant. The second error is the login URL needs to be changed from ".com" to ".us" to denote govcloud. After those two changes, the script ran mostly without issue up until the logo file clean up at the end. I've attached a screenshot of that error.