Oct 29, 2018
Thanks for the post, and welcome to the community.
Alexa Reminders are not yet available on the Home Speaker 500, and are only available on native Alexa devices (like an Echo Dot).
Brandon - Community Support
Dec 8, 2018
Thank you for the question.
We have passed this feature request along to development at this time. We cannot guarantee that this function will be implemented.
If we do have any new updates or information, we will be sure to communicate this with everyone.
Joel - Community Support