401 Unauthorized status in /v1/recruiting/applications

I am trying to use your API to implement a few features into the website.

I make two requests:

the first one - is to get a token via https://api.personio.de/v1/auth (I get the token, everything is ok)
and then I make the second request https://api.personio.de/v1/recruiting/applications ( and I get 401 Unauthorized status here).

Other requests with getting the data via a token work correctly.

Could it be because I'm using a free 14-day trial? Does it have some kind of restrictions? Could you please support me with this issue?