Accessing a user servers /lab endpoint gives 404

[jsguerrero]

The jupyter doesn't work with lab interface, it only works with tree and nteract, but when I try to use lab I get 404 error.

On the logs only show
[W 2021-09-16 10:34:36.385 SingleUserNotebookApp log:189] 404 GET /user/admin/lab

any suggestions?

Thanks

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[consideRatio]

There is too little information is provided for me to debug this.

What system is this running on, what config have you used, is it a fresh installation, what logs does hub / traefik show, etc.

If it is a bug, I wonder if it could relate to not having JupyterHub 1.4.1 rather than 1.4.0, and missing out on a bugfix there I recall could be relevant? I think in that case, it should be resolved by #719 and #732.