Gmail sign in?

Made a new email account on gmail for a new xbox gamertag and apparently I can’t sign in to Waypoint or with a gmail account. How do I log on? (this is an old account that I don’t use)

need to set your email in the dashboard to your new gmail. thats what i did. i can log into waypoint and with gmail addy. if all else contact support.

Thanks a bunch for the help, got the account up and running.