Outlook not recieving or sending emails

Hi,

My outlook is working fine with Sending and Recieving 2 of my Gmail accounts.

The 3rd account will not Send or Recieve.

I have gone into accounts and tried to repair the account but I keep recieving this message:

"We wern't able to set up your Google account with IMAP. You may need to make changes to your G Mail settings"

I have looked at my other 2 accounts that are working and the settings seem the same.