Error 403 when accessing the REST API with token Follow

Hi,

I ran into problems when using a token for the authorization of a POST request for the REST API.
I add "Authorization = "Bearer token" to the header and for a GET request it works fine.
However, if I want to perform a POST request (like adding a new build into the build queue), the authorization does not work and I get the eror code 403 back.
What am I doing wrong?

Thank you very much for your help.

Best regards,
Julia