It's great to hear that you've already verified that the emails entered in for your customers are correct in QuickBooks Online. This is the first troubleshooting step in ensuring that forms sent from the program make their way to where you need them to go. I'll help you from here with a few more troubleshooting steps to figure out why the recurring invoices are showing as undelivered.
Apart from checking the emails assigned to your customers, the next important step is verifying whether your customers did actually receive the emails or not. This will help us know whether what you're seeing is simply a display error or whether there's perhaps a larger issue at hand. I recommend taking a moment to check with your customers to confirm whether they received the email.
It's also helpful to determine if this is happening with only one recurring invoice that has been set up or if it's multiple. If it's just the one, the best way to troubleshoot is to recreate the recurring invoice to see if it was just a problem with that template rather than the setup overall. It sounds like you have the steps for setting up recurring transactions down pat, but in case you need it, here's our article: Create recurring transactions in QuickBooks Online
Next, I suggest going through the following cache, browser, app, and Internet troubleshooting steps to see if they help resolve the issue and push the email through. Give these a shot to see if they make a difference.
Reset your Internet or try on another computer or device
Finally, if you're still running into trouble, contacting support is your next best option. The support team member you connect with will be able to gather all of your details to determine if there's more troubleshooting that can be done or if this is something to get the engineering team involved in. We've had reports of issues like this in the past that have had to go to the engineers, so it could be the case this time around as well.
I hope that helps!
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