When accessing your Gmail account via remote fetch for the first time you may receive an email from Google with the subject line "Google Account sign-in attempt blocked." A sample is pictured below along with the resolution.

Solution: Authorize access

1. From the Google email, click on the link under "If this was you"

2. You will be taken to a page that allows you to enable less seucre apps

3. Click on "Enable" then click on "Done"

You will now be able to fetch mail remotely from your Gmail account.