Iframe url not available for JSD customers

Using the REST end point:


and the iframeSrc that is returned in the response a 401 is returned for JSD customers when using it in an iframe.

We have previously reported that the url doesn’t work for JSD customers on Safari due to the blocking of third party cookies that is now default in that browser. Now it doesn’t work in other browsers either (probably due to another technical issue than on Safari). This was discovered yesterday so maybe something has changed?