If you haven't already done so, you will need to update your settings in Zendesk to allow this kind of HTML content. Follow the steps below, based on this Zendesk help article: [https://support.zendesk.com/hc/en-us/articles/115015895948-Allowing-unsafe-HTML-in-articles](https://support.zendesk.com/hc/en-us/articles/115015895948-Allowing-unsafe-HTML-in-articles)