Gmail app reinstall

Hello. I have an iPhone and have been using the gmail app for a while. Since yesterday I noticed that my emails were not coming in as expected. I decided to delete the app and reinstall. I have reinstalled the app but can’t complet the sign in. After clicking on the sign in button at the bottom of the landing page I am sent to the “manage accounts” page. Here I my existing gmail email address and a button to toggle on or off. Underneath there is a button that says “Remove from this device”. And below that another button that says “add another account”. No matter what I try I can’t complete the sign in and get to my inbox. Please help.