So I’ve just realised that when trying to verify my email address on this site that I somehow managed to typo it 
but when I correct the error it doesn’t send the verification email (and yes I did actually type it correctly this time.)
I would imagine you are talking about the email tied to the Halo Insider Program. I would try to completely remove and retype the email and check all junk/spam folders for the verification link as well. If this still doesn’t work, you may need to try another email.
Did you manage to get this fixed i did the same mistake and when i try to re-type the email correctly it still says it sent it to the old one
In the bottom right corner of the screen, click Sign Out. Then it will let you re-type your email correctly.