Whiteboard Voting

I'm using Zoom Workplace provided via my academic institution licence. I want to use the whiteboard voting feature during a workshop that will be attended by mostly external participants that are unlikely to have Zoom accounts. In my trials it seems that it is not possible to participate in a vote unless the person signs in. I want to keep the process as simple as possible as many of my participants are older. Is this a limitation of using the Whiteboards or am I missing something in the settings that I can change to allow everyone to vote?

I know i can use polls, but the vote function in the whiteboard better suits my needs.