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Thanks for raising this question and I'm sorry to hear that your external users are unable to vote on polls. I've verified in my vanilla environment that an external user should be able to vote (using default settings) if the poll is created in the same place the external user has access to. It's possible this could be a misconfiguration. I would recommend submitting a support case in your Jive Community customer group and a team member will help you troubleshoot this directly.
Let me know if you had any other questions on this.
Thanks for your help !