Thank you for jumping in, CRH2488.

This is actually a known issue and is being investigated by our engineers. If you have time, please contact our Chat Support again and request to link your account to the open ticket. This way, you'll receive updates about the investigation.

You may not let your customers create another email account. Instead, you can download their invoices and send them outside QuickBooks or share an invoice link that they can open online.

I'm just a comment away if you have other questions about invoicing. Take care and have a good one!