on AWS - winSRV 2019 - no remote desktop license servers available to provide a license

All the trick seems to be that I'm under AWS. I found many solutions to solve that problem as connection can be made directly on the server. The issue I have is that I'm running the server on AWS, therefore, only RDP connection is available. As the server is part of the domain , I added the server as part of the server manager ones on my Domain controller.I tried several times to install/uninstall the RD diagnoser AND the RD License manager. When I try to run each one, I get " Server Manager can not open the tool Checked with Powershel,, the component install is properly done ( or at list seems to for the system ). I tried to reset the grace period for RDS server ( info here: https://mangolassi.it/topic/19353/reset-120-day-grace-period-for-windows-rds-server-with-powershell but no effects. I would need first to get back access to a session, which could be a good start Thanks for your insights