Cannot Get SSRS Report to Display in Iframe on Contact Form

In CRM 2016, on the contact form, we are trying to display in an IFrame an SSRS report that takes the current contact's id as a parameter.  It looks like the report viewer is being displayed, but the report doesn't run.  The iFrame's initial URL is about:blank, which is switched in javascript to: 

Xrm.Page.context.getClientUrl() + "/crmreports/viewer/viewer.aspx?action=" + encodeURIComponent("run") +
"&id=%7b" + encodeURIComponent("40A783AE-95C0-E611-80D9-000D3A14F6A8") + "%7d&p:Contactid=" + encodeURIComponent(Xrm.Page.data.entity.getId());

How can we successfully display an SSRS report on a contact form in CRM 2016?