Quickbooks online automatic invoice reminders stopped working in June. I have tried to reset the automatic reminders but not working

Thanks for bringing this up in the QuickBooks Community page, @SCS0311.

Upon checking, I've found out that we have an ongoing investigation about automatic invoice reminders. Some of our users are unable to use this feature on their end. 

Our product engineers are aware of this problem, and are now working hard to fix this the soonest. I recommend giving our Customer Care Team a call to add your account details to the list of affected users. This way, you'll be updated as soon as a fix is implemented.

Here's how to contact our customer support:

1. Click the Help menu in the upper-right hand corner and click Talk to a human.
2. Type in "Talk to a human", then press Enter.
3. Look for I still need a human and click on it.
4. Select Get help from a human.
5. Choose between Chat with us, Schedule an appointment, or Have us call you.

Please check out our support hours to ensure that we address your concerns on time.

In case you're using QuickBooks Online Advanced, you can set up workflows to send reminders to your customers or your team.

Also, our Help articles might have something that can help you with your QuickBooks concerns, too. Simply enter a keyword and browse for related topics.

If you have additional concerns or need anything else, let me know. I’m always here to help. Have a good one!