Tensorboard throws 404 not found

tried every solution on google to render tensorboard on jupyterhub notebook on kubernetes.
it just keeps throwing 404 error.
even made the code change in tensorboard/notebook.py as mentioned in https://code.tubitv.com/jupyterhub-on-kubernetes-da8940488529
and here is the image i’m using for the user profile

  • display_name: “tensorflow environment”
    description: “The tensorflow image!”
    image: jupyter/tensorflow-notebook:3b1f4f5e6cc1

i’m trying to run without GPU. the same image works fine if i bring it up with docker. Tensorboard renders. But on K8S with jupyterhub, it just does not render tensorboard
please help with this issue