Account for RocketChat
To log in to RocketChat, use your SIC account, not the university account.
Normally, all students should automatically get an account, but it appears that an employee shortage has delayed this process.
If you do not have a SIC account, follow the instructions at https://it.cs.uni-saarland.de/students/accounts to obtain one.
If you have one, join the channel #ifc (password: non-interference).