Password pop up

I recently changed my password on my microsoft outlook account using my iPad.I now keep getting a pop up on my iPad to “enter the password for the outlook account ........hotmail.co.uk “ and the option of cancel or settings. When I go to settings I am unable to click on the account as it is greyed out and when I click reset password a screen quickly pops up that states hotmail account at the top but quickly disappears. I am unable to send or receive emails. I do have an iPhone and whilst the pop up does not appear on there the state of play with emails is the same and at the bottom of the screen says account error exchange. When I click on details it says can not get mail, the connection to the server failed.