cloudHQ Gmail Online Polls & Surveys has the intelligence to detect whether the poll link is accessed by the person who created the poll.
This means that poll will not work if the links are open in the same Google Chrome Browser in which the poll is created (e.g. if you send an email from your email account to another account of yours and then you just open it without logging out from cloudHQ).

In order to properly test Gmail Online Polls & Surveys, you need to open the link using the browser in which you are not logged into cloudHQ. For example, open it in Google Chrome incognito window.

The suggested way to test it is to send the test emails to your colleague or a friend.