Hello 🙂
Thank you for purchase and welcome to the Premium Plugin support forums! I was not able to reproduce the issue you described. I went ahead and created a short screencast documenting the behavior I experienced when creating a new event and attempting to sync it to Eventbrite.
I see you checked ‘Yes’ to reverting back to the default WordPress theme and deactivating all plugins other than ours as instructed in the Testing for conflicts guide, but can you please confirm this? If not, please do so and let me know what you learn.
Can you visit Events > Settings > APIs and hit the Remove Authorization button near the bottom of the page under the Eventbrite section? After the page refreshes, hit the Get Authorization button in the same location and let me if it authorizes correctly. The Remove Authorization button will reappear the authorization went through.
Let me know if reauthorizing makes a difference when attempting to sync an event to Eventbrite and we’ll go from there. Thanks and have a good evening!