I too have had password problems with the Qobuz free 30 day trial (from Qobuz rather than via Roon). I’ve followed the password reset route twice now, rebooted my Roon core (on a Synology 918) and still getting ‘bad username/password’ message when I try to add Qobuz as a service.
Qobuz is working fine on its own and has been all day - into my iPhone and on my Macbook pro. Really enjoying it - but I really want it as part of Roon.
I’m in the UK so not expecting access issues.