How to apply jupyter server extension on TLJH?

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Hi.

I want apply jupyter server extension TLJH, but It doesn’t work
If I run jupyter server extension list I get the below output

nteract_on_jupyter enabled

  • Validating…
    nteract_on_jupyter 2.15.1 OK

I make jupyterhub_config.py

export JUPYTERHUB_SINGLEUSER_APP='jupyter_server.serverapp.ServerApp'

but It’s not solve the problem.
server response message is Bad Gateway.

I going to apply module is nteract_on_jupyter