Hi there, @Stewart Engr!
Let's perform some browser troubleshooting steps so you can successfully send the reminder of your unpaid invoices.
To start with, let's access your account in a new incognito or private window of your browser to check if it's not your browser causing the issue. From there, you can send again the reminder of your unpaid invoices.
Once you've successfully sent the reminder, you can clear your browser cache to optimize it's performance and your surfing experience when accessing QuickBooks.
However, if you're still unable to send it, let's switch to a new browser application. And then, access your account and send your invoice reminder from there.
Also, you have the option to add QuickBooks as one of the trusted sites of your browser. Let me show you how:
This way, you you can prevent your browser from blocking some content when accessing QuickBooks.
As always, you can visit our Help Articles page for QuickBooks Online if in case you need some "How do I" steps.
It'll be always my pleasure to help if you have any other questions. I'll be keeping an eye for your response.
I appreciate the detailed response and for trying the troubleshooting steps, Stewart.
Browser troubleshooting might also work because QuickBooks Online also uses cache files to boost the program process. However, they can also cause unexpected issues when piled-up on your browser.
Here are the reasons why Jonpril provided those steps:
Meanwhile, we have an open investigation about this issue that customers weren't receiving CC or BCC copies. Our engineers are already working to fix it.
I'd recommend contacting our Customer Care Team. They can add you to the list of affected users and will provide updates though email messages.
Here's how you can reach them:
We'd appreciate your patience as we work on this.