How to resolve iframe CSP directive issue

I am attempting to debug why an iframe is not working in our workshop module. It has never worked, and I am uncertain whether the issue lies on our side or with the external source. I am encountering the following error:

Refused to frame <url> because it violates the following CSP directive: "frame-src 'self'".

We have already changed the Content Security Policy (CSP) in Control Panel to allow the given URL, but the issue persists. How can I resolve this CSP directive problem to get the iframe working?

Follow steps here: https://www.palantir.com/docs/foundry/administration/embed-foundry-externally/#embed-external-resources-in-foundry

Note that the Foundry workspace applies the user’s primary Organization’s CSP additions. If the workshop app is accessed by users of the Organization and guest users of the Organization, needs to be added to the CSP additions in Control Panel for both Organizations.