Good afternoon Peter and welcome back!
Thank you for reaching out to us.
We are sorry to hear about the tickets not being sent to your customers.
I would love to help you with this topic.
The WooCommerce email settings are not used as part of our plugins.
You can decide when the tickets are sent based on your settings under Events -> Settings -> Tickets (at the very bottom of the page).
If the tickets are still not sending, you can 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. This usually solves any ticket sending issue you might have.
Please make sure you configure and test the settings using the plugin’s built-in tool.
Let me know how that goes.
Best regards,
Geoff B.