Is it possible in remoteapp to connect to the second user to provide assistance?

Question

Remote access

Windows server 2012 R2 Standard
There is an application published via RemoteAPP. Is there an option to manage remoteapp for help on this app. That is, user 1 is a local admin on a server with full RDP, user 2 is a remoteapp user. According to the logic in the device manager in the "users" "remote control". The only thing, but this function was present until 2012 R2 was removed "for security reasons". That is, the question is how to allow the local admin to remotely manage at least a regular RDP session?