Hi everyone! My name is Hallie, and I’m an Associate Program Manager on our CXM team here at HubSpot. I’ve been working with product managers to get insight on some popular feature requests, and wanted to share an update for this particular one. 
Embedded Polls in emails (similar to things like embedded forms) require AMP, and currently this technology is only supported in Gmail & more recently, Yahoo. Our product team confirmed this is a feature request they’re aware of and would like to explore more, but because of the current limited support in major email clients as well as other high priority projects, this isn’t actively being explored.
As any future updates with this arise, I’ll be sure to share those with you all here. Thank you for your continued patience, and please continue to leave feedback around how this feature would be beneficial for you and your businesses!