Hello, @sovay-sovayberri.

I'll share information and troubleshooting details to ensure you're able to see the customer replies from the invoice email you've sent.

The customer replies should be sent to your email. Since you haven't received responses from your clients, I recommend checking your spam and junk folders, as important emails sometimes end up there. If you see one of the emails from them, right-click it, then select This is not spam or Not Junk.

If you're still having troubles receiving their reply, I recommend contacting your email provider. They can help you further evaluate security settings for your email profile. 

Also, you can check out this article on how to handle the invoices when you receive the payment: Record invoice payments in QuickBooks Online.

If you have any further questions about managing your invoices, feel free to reach out. We’re here to help!