Thanks for following up on this, @showhomessandiego.

Currently, the function has not yet been updated by our product developers. Once the option is accessible, they will get in touch with us. In light of this, I'd advise submitting another feature request to our product engineers. They can examine that and possibly include it in the upcoming version.

Here's how: 

1. Go to the Gear menu on the top right. 
2. Select the Feedback button.
3. Type your suggestion in the box and click Next. 

Many of the program's current features, as well as upcoming ones, are based on requests and feedback from users. QuickBooks also has a website where you can vote, comment on ideas, and suggest your own: Customer Feedback for QuickBooks.

As a workaround, copy the email you received and consider manually emailing the message to the other email address to which you want the notification to be sent.

I cannot tell when our development team will release an update for QuickBooks Online's payment notification feature. You might want to check out our blog website to stay up to date on the feature release.

Additionally, feel free to check out our FAQs to get answers to common payment questions: QuickBooks Payments FAQ.

If you ever need further assistance, do not hesitate to reply to this thread. I will do my best to provide support. Take care.