Viktor Kemenczei

We experience the same problem where the iframe source code doesn't display in Zendesk Guide articles. After a little research, I have found that iframe embedding actually possible, although only from authorised domains. I'm unsure how to get your domains authorised by Zendesk, but it's worth a try reaching out to them.

Source article:
https://support.zendesk.com/hc/en-us/articles/4408824584602#topic_bjj_r4x_kxb__section_t4m_rrx_kxb

See the screenshot of the section below: