Hi there, we’re also still experiencing this issue.
Just to provide a bit more information – when the page redirects back from the Eventbrite Allow/Deny page to the ‘import’ page in the WP dashboard, we’re seeing 400 (Bad Request) errors on the following resources:
https://ea.theeventscalendar.com/api/aggregator/v1/origin
https://ea.theeventscalendar.com/api/aggregator/v1/eventbrite/validate?referral=ourdomain&url=ourdomain&secret_key&licenses%5Btribe-eventbrite%5D=ourlicensekey&origin=eventbrite
(our credentials redacted)
Hope this is of some use in resolving the issue.
Kind regards,
Tom