That is usually because you are retrieving your emails via Outlook or Hotmail. 

Both systems use the live.com system, which can lead to an account conflict if you try to verify another live.com account from these programs. 

Please copy the verification link into the clipboard and log yourself out of your Hotmail account or close your Outlook. Now open your browser and insert the previously copied link into the address line and confirm by pressing Enter. The verification ought to work now.