Hello there, Robbie2. Thank you for confirming that you’ve checked your junk and spam folders. Please ensure that the recipient’s email is correct within the transaction itself. If it is, a quick data refresh can help clear any glitches that might be affecting how emails are sent. To do this, go to Menu > Settings > Refresh Data and select Yes. If the issue persists, consider uninstalling and reinstalling the QuickBooks app to reset underlying app issues.
If that still doesn’t work, try logging into QuickBooks through a web browser, go to Settings, clear the company email, and then re-enter it exactly as it should be. This ensures that QuickBooks is sending emails from a verified address. For more details, you can check out this: Solutions for when customers aren't receiving your emails in QuickBooks Online.
In the meantime, you can save the transaction as a PDF and email it directly from your preferred email client, or send it via a web browser to ensure your client receives it promptly.
You can revisit this thread if you have follow-up questions.
