Looks like the API request to webinars/WEBINAR_ID is not returning nil for the start_time of the webinar from Zoom. You might want to test your API credentials outside of the plugin, using a tool like Postman, for example.
Looks like the API request to webinars/WEBINAR_ID is not returning nil for the start_time of the webinar from Zoom. You might want to test your API credentials outside of the plugin, using a tool like Postman, for example.