[Edit]
I can see that an activation code has now been sent for your account. Once you receive this, add it to your account (through the SMTP settings screen), and it should all be working all OK
Have you received any suspicious login attempts on your account? If so, you need to clear them. QuickFile sometimes shows up as it’s automated - it just raises a flag with Google
[Edit]
I’ve just tried this fresh with a different gmail account and different QuickFile account, and Google blocked the attempt. The email however was sent to a secondary email on the account. You need to review your devices and allow it if you can - the details will be in the email
Try port 587, and you may have to enable “less secure apps” in your google account settings. Alternatively if you have 2 factor authentication enabled for the Google account then you will need to generate an application specific password for SMTP.