I have a new problem,
I try to use the Mautic consumes API module.However I get an error message on the Primary Company field. Have you encountered this problem before?
The error 403 normally means access forbidden. So it is either a sign that your credentials are not valid in general or that they do not have the right to access the endpoint which gets used here. Meaning in that case that it is not allowed to query the companies.
For future reference, I have created a quick cheat sheet of HTTP codes that can be very helpful when troubleshooting APIs: HTTP Status Code