Going through the question, I believe the** HTTP 403 error** code might occur when the API key being used is invalid or has been disabled.
Further, I would check the user credentials and headers added in the request.
You can refer to the [Authentication with the REST API](https://community.denodo.com/docs/html/browse/8.0/en/vdp/data_catalog/appendix/rest_api/rest_api#dc-api-login:~:text=Authentication%20with%20the%20REST%20API%20of%20the%20Data%20Catalog****) of the Data Catalog section under Data Catalog Guide for more information.
For your scenario, I would also take a look at the vdp-data-catalog.log file located at <DENODO_HOME>\logs\vdp-data-catalog\ directory to get more information on the issue.
Hope this helps!