Can't login with the Instagram App

I can log into instagram via a brouser but not with the app...When I try to login with the app it says "there is a problem with your request" and my only option is dismiss...Not being able to login with the app means I can't send or receive messages from IG...Anyone else having this problem? HJ

I'm able to login with the app on my Grandson's phone..Is ther some kind of cookie I need to remove? I have uninstalled the app several times and re installed it after turning the phone off and on....HJ