I only tried once to use Blue Prism on terminal service enabled VM and didn't succeed in my quick test. Unfortunately I cannot recall the exact errors since it was no real evaluation.
I assume Windows Server 2019 allows several user sessions at the same time. My wild guess is, Blue Prism does not support concurrent Windows user session on one host, since it does not provide any means to manage them. It is only possible to send processes to a host, not to host + session.
I would be really interested to know if someone runs BP in parallel Windows sessions (or even single session only) on Windows terminal server.
Or it is related to this:
https://community.blueprism.com/communities/community-home/digestviewer/viewthread?MessageKey=3d29922e-5932-40ef-892f-a2e1203d5dd9&CommunityKey=3b501789-976c-4cfa-b9db-88307c6a0a86&tab=digestviewer------------------------------
Walter Koller
Solution Manager
Erste Group IT International GmbH
Europe/Vienna
------------------------------