I'll help you view your bounced emails and their errors, @SUSAN DENT

Ro ensure I provide you with the best fix, were you able to follow the troubleshooting steps shared by my colleague MirriaM above? If not, I recommend doing so to isolate this issue.

If you have and the issue persists, I suggest contacting our support team. One of our live agents can securely look into your account and investigate the cause why you're unable to view your bounced emails. To reach out to them, you can refer to the steps provided by my colleague Mark_R above.

When everything is all set, you might want to check out this article that can help you in accounting for your customer payments: Record invoice payments in QuickBooks Online. 

I'm all ears if you have any other questions about your invoices and QuickBooks Online (QBO). Please feel free to add them in your reply, and I'll take care of them for you. Have a good one!