Good afternoon Vladimir and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
We are sorry to hear that you are struggling with QR code check-in as well.
I would love to help you with this topic.
Although the issue seems similar, the cause can be quite different.
The good news is that there is no known bug with the QR code check-in.
I have tested it thoroughly and it works. It will more be a matter of finding out why it does not work for you. Can you:
- Tell me which QR code app you are using ?
- Confirm if you are logged-in the WordPress site with a user that has at least the “Edit post” capacity ? (admin user or custom role)
- Send me a copy of the latest version of your WordPress theme / child theme via a link to a .zip file link (stored Dropbox or Google Drive) so that I can run some tests on my end ? I recommend a private reply for that purpose.
Please ensure you are using the latest files as found on your actual website.
This way I will get access to any updates or customizations you might have made.
Hang in there!
Geoff B.