Sendinblue API - Error message

Hi,

I´m using sendinblue as an external e-mail system, which works great. now i am trying to get information about the campaigns via the api interface.
unfortunately I always get this error message:
" An error occurred when calling Get All
Could not find any results. Are you sure the Results Key is correct? You can update that by going back and clicking into “Get All”

At “full response” all everything is shown but I can´t create a collection.

Do I need “Results Key” and what is that?

Thanks, Denniserror

listID is your result key