RHT_COURSE not set in online labs

Hello,

I'm currently (for reasons of $doitall) on the RHCSA beginner course, course book chapter 9: Practice: Restricting SSH Logins.

This requires resetting your machines and firing up "lab ssh start" in the beginning. The latter then terminates with "Error: RHT_COUSE not set!"

Looking at where "lab" resides I could see in that script it refers to /etc/rht, and the variable indeed is initialized but not set to any value. Unfortunately, I have never looked into this while it was still working, so I have no idea what values would be expected here.

Finally, yesterday everything was working, so I encountered this a) only today b) when doing the SSH chapter.

It says "Please contact your instructor", and as $instructor is also not set in my brain's memory, I'm coming here :)

Any ideas what's going wrong here?
For details about my machines, application roles, ... feel free to PM me if you can offer help.

Cheers