Unable to set default app for user environment in TLJH

JupyterHub The Littlest JupyterHub
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Hello.
I’ve run into issue where I’m unable to set user environments default app to jupyterlab.
My current approach was to add it to config with commands shown in documentation as:

sudo tljh-config set user_environment.default_app jupyterlab

Also i tried to do it manually on /opt/tljh/config/config.yaml, but no luck - I did tljh-config reload, and even server machine restart, but still get /tree as startup page, of course I’m able to swap url manually to /lab, but that is not expected workflow for other users on my server.

My current configuration (obfuscated):

users:
  admin:
  - xxx-admin
  - name.surname@domain.com
https:
  enabled: true
  letsencrypt:
    email: email@email.com
    domains:
    - xxx.domain.com
services:
  cull:
    every: 3600
    timeout: 3600
    max_age: 0
    users: false
    enabled: false
user_environment:
  default_app: jupyterlab

Any leads where i should look further?
Thanks a lot for help, hope to see some answers.

Regards,
ReWin