I would also like an answer to this as we have a managed Workplace
account tied to our SSO require that we not need to create unmanaged
accounts to access Horizon Workrooms.
Yep, this is pretty bad. I saw your other post about it requiring a
separate login and that's where I ended up as well after opening a
support ticket with Workplace and the answer from there being they don't
support Workroom. This is a pretty bad way...