@ thfrede wrote:
I only know how to leave the email and go to Gmail. I do not know how to keep the email window open
It may be a matter of semantics, but it's not an "email window" that you keep open. It's the TurboTax program window that asks for the email verification code that you have to keep open.
If you're using a computer, while keeping that browser window open, launch another instance of the browser window or use a separate browser tab to check your email while leaving the TurboTax window/tab open. Or if you have a second browser on your computer, use that second browser to check your email while keeping the first browser window open. Or you can leave the computer TurboTax window open while you use your phone to check your email for the code.
