I have a new RemoteApp server and tried to launch an app. I get the RDG prompt, I enter my credentials, Duo pings me, I approve the access and, after it successfully logs in, get an error that says “Windows cannot start the RemoteApp program. The following RemoteApp program is not in the list of authorized programs: <any published program, e.g., Calculator>. For assistance, contact your system administrator.”
I originally thought it was a RemoteApp problem and contacted Microsoft since Duo did authenticate just fine. They pointed out their log shows it’s a problem with Duo.
So, I build a new RDG/RDCB/RDW without installing Duo for RDG and I was surprised that RemoteApp worked flawlessly.
I do have a ticket opened with Duo on this very issue but I wanted to let everyone searching for solution to the same problem that I’ll post here what the solution is. I did search the forum and didn’t find a solution. I am aware that RemoteApp is disabled when Duo for RD Web is installed but I only installed Duo for RD Gateway, not Duo for RD Web, so that one does not apply to me. Wish me luck!