Let makes sure receipt forwarding works perfectly with your Gmail, vanessa-papillon.
It seems that you're in the process of setting up your email. You'll have to ensure that each verification step is followed as outlined in the Forward Receipt article such as entering the verification code so you'll not be getting the error.
You'll also want to use another web-based email provider other than Gmail to double-check if you'll
be able to receive the receipt. If not, I recommend contacting our support team to investigate this further. They have the tools to pull up your account in a secure environment.
For your reference, I have these helpful articles that you can read if you need additional information about QuickBooks Self-Employed.
Feel free to let us know if you need further assistance in the forward receipt feature. I'll be here to help.