Ebenezer, as Jonathan has outlined already, Qradar should ask you for setting a password during install process. Shubham and I are just working on a similar installation issue in workstation 17.
There are so many things that possibly can go wrong during setup when you are not meeting requirements needed. My guess is that your setup did go "sideways" somewhere. What I can offer is a MS team session to have a look at your setup. Just write to my inbox if you like.