Embedding a Zoho Learn portal into a Zoho Creator page

Embedding a Zoho Learn portal into a Zoho Creator page

Does anyone know how to embed a Zoho Learn portal into a page in a Zoho Creator app please?  My portal URL works fine when I just paste it into a new browser window.  But when I put it into an HTML snippet in a page, it says it "refused to connect".

The portal is set to public access and this is my HTML snippet:
  2. <%{
  3. embedURL = "https://prospera-software-guides.zoholearn.com/s/twam/m/twam-apply/";
  4. %>
  5. <iframe frameborder=0 width="1400" height="2000" src="<%=embedURL%>"></iframe>
  6. <%}%>