I tried to do this, as did another person I spoke to privately on here, and we have determined it is not possible: https://community.splunk.com/t5/Dashboards-Visualizations/400-Error-while-rendering-splunk-into-an-iframe/m-p/568621 Essentially the cookies are "3rd party cookies" as they are not from your site. I believe there is actually a setting in your browser you can change to allow these. This worked for me a while ago. I am not sure if it works currently as I do not have Splunk in an iframe anymore. When I told my manager this, they immediately dropped the ask and stopped the idea of the iframe.
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