Account action required on old Nexus

[Android Central Question]

We have an ancient Nexus and it has my google account on it, plus a guest account my kids use. On the guest account, I keep getting these things about "account action required" for multiple emails/accounts. Can someone explain what this is about? I can't seem to find where in the settings the device even knows about these random accounts. One is for my kid, one is my wife's (who never uses the thing) and the other is totally random that I've never even heard of. How do I clean this up?

 

[B. Diddy]

Welcome to Android Central! When you see that notification, what happens when you tap it?

 

[Chuck37]

OP here. It goes to a google login screen and wants a password. I don't know a password though, since I've never heard of the account (at least one of them). I'd rather just make the device forget about these accounts. Really, I'd like to understand what it thinks it's doing anyway. How is it logged in to 3 accounts at the same time, or something?

 

[B. Diddy]

Go to Settings>Accounts>Google​. What accounts do you see there?