I understand how frustrating it is to sign up for a service and not work the way it should. Rest assured, I'll do my best to help you get this sorted out.
Before we start, can you tell us the specific error you're getting when sending email invoices to your clients?
If not, we'd be happy to hear more about it from you. This will help us in providing you with the appropriate steps to fix the problem.
In the meantime, try sending the transaction using a private window. This way, we can check if the problem is related to a cache issue. Simply press these shortcut keys to access this mode.
Mozilla Firefox: Ctrl + Shift + P
Google Chrome and Microsoft Edge: Ctrl + Shift + N
Safari: Command + Option + P
If it works, go back to your regular browser and clear its cache. If you continue to experience the same results, try using another supported browser.
In addition, you can visit our Help Articles page for QuickBooks Online in case you need some references for your future tasks.
Feel welcome to the Community again if you have any follow-up questions or need additional assistance. I'm always ready to lend a hand and guarantee a seamless experience.
If you've tried the steps my colleagues provided and they didn't work, I recommend contacting our Customer Support Team for further assistance. Here's how:
Go to the Help menu.
Press the QuickBooks Desktop Help option.
Click the Contact Us button.
Enter your question and tap Let's talk.
Scroll down and choose to Get a callback.
Keep us updated on how the call goes. Have a wonderful day!
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