To modify and use an already existing project on the platform via API (Application Program Interface) for either design or parametric studies, the user needs to allow permission from the platform manually. This is a safety feature so that projects are not accidentally modified or used.
Here is an example of how to do so:
- Select your project of interest from the Dashboard.

- Click on the edit project icon on the top-right corner as show.

- Then toggle on the Allow API access ? alternative.

Note
If none of the above suggestions solved your problem, then please post the issue on our forum or contact us.