We actually ran into the same issue yesterday. That is the: Webinar Registration Unsuccessful (attendee limit reached). And our GoToWebinar form didn’t have a limit.
From the WP GoToWebinar administration page we re-logged in to GoToWebinar and then the error ceased. Guessing the login token needed to be refreshed or something.
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This reply was modified 4 years, 4 months ago by ryanmusique.