Good evening David and welcome back!
Thank you for reaching out to us.
We are sorry to hear about the issues you have encountered with our QR checkin functionality.
I would love to help you with this topic.
As a first step, I would recommend reading the following: https://theeventscalendar.com/knowledgebase/using-qr-codes-event-tickets-plus/
Secondly, can you confirm that you have logged-in to your site’s wp-admin section prior to scanning the ticket ?
Finally, could you please provide us with your complete system information in a private reply using the instructions found in the following link?
https://theeventscalendar.com/knowledgebase/sharing-sys-info/
Hang in there!
Geoff B.