How to fix Scheduling poll Issue?

Recently started using scheduling poll after Find Time was removed from Outlook. As someone who sends the poll, the process is a little lengthy and annoying, but otherwise--seems to provide me with the same things Find Time (i.e. notifications when people vote and quick scheduling option). My issue has to do with the users of the poll who are unable to vote as needed.

I was informed recently by a user who voted on a poll that when they clicked the link to vote, they were brought randomly to an outlook inbox and the poll was nowhere to be found. I had them do this in front of me and it did seem to just pull up an inbox in OWA, but no poll was found. This individual is using a mac; however, that is all the information I have regarding their device.

I cannot begin to trouble shoot this because I can't understand what is re-routing them to an inbox.