Verification window not appearing on the web when trying to login
So, in my browser I go to: https://www.icloud.com/ enter my username and password, a message is sent to my iphone/watch/ipad asking me if I'm trying to login, I click Approve, a verification number is shown on the phone, but back on the page I'm trying to login with isn't presenting me with a window to enter the verification code.
Shirley i'm not the only person to have this problem?
I'm using latest version Firefox on latest version of MacOS.