Hi @galvanicmac  , thank you for asking in quickbooks community. Have you checked the email address in recurring transaction? If not yet, you could follow these steps: 

1. Click the Gear icon. 
2. Choose Recurring Transactions. 
3. Open the Recurring invoice, and check under Email if the email enter. (You could thick automatically send emails beside Email).
4. Tap Save template if modify made.

Then check your email, did it sent?

You could check your email account too. I'll provide the articles relates to your problem.

- Edit recurring 

- Manage recurring 

- Recurring transaction doesn't send automatically 

Comment back for every assistance. Cheers.