Hi there, userekohn.
Let me make it up to you by making sure you'll be able to send invoices in QuickBooks Online.
You can isolate and rule this out by using a private or an incognito window (doesn't use the existing cache data).
Use these shortcut keys to open an incognito window:
Log in to QuickBooks and send your invoices again. When you're able to do so, go back to the regular browser and clear the cache. This will remove the webpage data that's causing the issue.
Close out any browser instances to complete the process. Though, you can also use another supported browser.
If you'd like to take care of your bank transactions and categorize them in QuickBooks, take a look at this article for a guide: Categorize and match online bank transactions in QuickBooks Online.
Don't hesitate to post again here if you have further concerns sending emails in QuickBooks. I'm just a post away to help. Take care always.
It is a well known issue for months and they have been struggling to fix it. Consider having a 3rd party connector for the time being. Their specialists are standing by to onboard your needs to send your invoices and connect it to your QB Payments account.
You have clicked a link to a site outside of the QuickBooks or ProFile Communities. By clicking "Continue", you will leave the community and be taken to that site instead.
For more information visit our Security Center or to report suspicious websites you can contact us here