"Facebook Password Required" popup

I recently got a new iPhone 8. Ever since then, my LAPTOP has been sending me a message. (I'm not sure if there is a connection between the two devices but it started happening right after I got the new phone.)

The message pops up and says "Facebook Password Required" and instructs me to "Enter your password for <<my email address>> in Internet Accounts. When I try to do that it tells me that the password is not valid. Now it's certainly possible I'm entering the wrong password, I have too many, but I'm pretty sure it's one of the ones that I have tried so far. The other thing is, I'm not at all sure why it's asking me for this information because I can access Facebook both on my laptop and on my phone. But it sure seems urgent because as soon as I click "Close" on the notification, it pops up again.

So, if anyone can tell me why I'm getting this message, that would be great. And what I can do about not entering the right password (since there is no Forgot Password? link), that would be great too.

Thanks!

Karen