Good evening Sherman and welcome back!
Thank you for reaching out to us.
We are sorry to hear about the tickets going straight to junk mail.
I would love to help you with this topic.
I believe the QR code not appearing is actually a side-effect of the ticket being treated as junk mail.
The simplest solution is to have the system send tickets from any chosen email address by simply installing, configuring and testing the following plugin: https://wordpress.org/plugins/easy-wp-smtp/
Using a real SMTP server with authentication will bypass the built-in WP mail functionality altogether.
Please make sure you configure and test the settings using the plugin’s built-in tool.
Let me know if that helps.
Have a great day!
Geoff B.