Can you try bumping up the amount of memory available for WordPress? We’re seeing some memory exhausted errors get thrown on your site when it’s trying to finalize the registration and send out the related messages. You can bump up the amount of memory available for WordPress by following this guide:
The support post ‘This registration step could not be completed (resolved)’ is closed to new replies.
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Support forum for Event Espresso 3 and Event Espresso 4.