I like to extend an extra hand to help, bethwins.  

I've checked with INV-71760 provided above by my colleague and found it's already closed. But don't worry, I have a couple of solutions to help you fix the issue.   

Solution 1, let's reset your email address. Here's how:  

1. Sign in to your QuickBooks Online account.
2. Go to the Gear icon, then choose Account and Settings
3. Pick the Company section, then select Edit in Contact info.
4. Check each email address and modify it as needed.
5. Press Save, then Done. 

If solution one doesn't work, we can clear and then re-enter your email address. 

1. Go to the Gear icon, then hit Account and Settings.
2. From the Company section, then select Edit in Contact info.
3. Clear the Company email field and enter the desired address as is, even if it appears correct. (Note: Be sure not to use any extra characters or spaces before, within, or after the address you enter).
4. Tap Save, then Done.
5. Send yourself a test transaction. 
6. If you still don't receive the email, try using a different email address with a different domain (for instance, if you were using a Gmail email address, try a Hotmail or Yahoo address instead). 

If the first two solutions don't work, check this article: 3 solutions for you when customers aren't receiving your emails. You can follow solution 3 for another option to help resolve the issue.  

If not resolved, alternative ways to send forms are:

• You can save your form as a PDF and send it via email through your business or another email address.
• (For invoices or estimates only) You can send your customer a link to their invoice or estimate through SMS or messenger service. Click on "save and share link" then select "copy link" and paste it into your SMS or messenger service.
• If you have a Gmail or G-suite email account, you can use the Send with Gmail feature to send QBO forms from your own address following the steps in Use your Gmail address to send invoices.
• You can save your document as a PDF, print it, and send your customer their forms via mail.

However, if none of the solutions above works, I suggest contacting our customer support team. So one of our agents can further check your account in a safe and secure environment and assist you with different solutions.  

The Community and I will be here to help if you have further questions or concerns. Take care and have a good one.