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Let's perform some troubleshooting steps to isolate this issue, @mking12.
I suggest running the repair tool to fix this error in your QuickBooks Desktop (QBDT) right away. This way, you'll be back in working order. Let me guide you how.
Before doing so, I recommend to back up your company file first. Once done:
For more information, please check this great article: Repair your QuickBooks Desktop for Windows
Then, in case you need to remove a credit from an invoice, check this article for details: Remove or unapply a credit from an invoice or bill.
I'll be around to help whenever you need assistance. Stay safe!
I tried twice with the same results. I can send statements but not invoices.
Thanks for keeping us updated, mking12.
Aside from what was already shared in the first reply, I have other options to recommend.
Also, based on the error message that you're getting, we'll have to make some changes or configure your internet or firewall settings in QuickBooks.
First, let's restart your computer. Dong this usually resolves issues or problems when using web-based features, including emailing transactions.
Second, let's operate Internet Explorer in Compatibility View. Here's how:
Once done, go back to QuickBooks and send an invoice again to check if you're able to it.
If you're still getting the same error message, please go to these articles and follow the other recommended steps:
Please continue to add a reply below to keep us posted. We'll keep revisiting this thread to help you again.