Good evening Adam and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
We are sorry to hear about the tickets not being sent. Yikes!
I would love to help you with this topic.
If you have not already done so, check out the When should tickets be emailed to customers? setting under Events -> Settings -> Tickets.
This establishes when the ticket is sent (in some cases, only when the order status is set to “complete”).
Another common solution is to have the system send tickets from any chosen email address by simply installing, configuring and testing the following plugin: <u>https://wordpress.org/plugins/easy-wp-smtp/</u>
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.