Can't use multiple accounts at the same time
Since Google Accounts through work, schools, or other groups have moved to a new infrastructure that allows users access to many more Google services, they use the Google Account sign-in cookie. This cookie lets you sign in with only one account at a time. If you need to sign in to more than one account at a time, learn how to use multiple accounts at once.
Ashley is an Accounts expert and the author of this help page. Leave her feedback below about how to improve it.