Jupyterhub kernel and terminal not connecting

I installed Jupyterhub using TLJH installation process and it worked fine on the first attempt. After restarting my container and setting up admins/users, the Kernels and Terminal stopped working for me. It says connecting for a bit and then it never happens.
I tried following a few articles but none seemed to help.

Can anyone guide me on the next steps?
Please let me know what information I can provide, thanks.

The instructions you’ve linked to are for developers of TLJH, i.e. people who want to modify the internals of TLJH.

If you’re not familiar with JupyterHub try following the standard installation instructions: