If you are sure that the User or API key you are using has the right permissions, it could be that your environment doesn't allow you to push data via the API. This is even more likely since you are running a C4C environment, where this could be the case.
If you are sure that the User or API key you are using has the right permissions, it could be that your environment doesn't allow you to push data via the API. This is even more likely since you are running a C4C environment, where this could be the case.