CSP error for SMS validation in iframe

Hello

I'm trying to integrate the signature process directly into my application.

On the server side, I'm using the PHP SDK, and on the front, I'm using Docusign JS.

I manage to create an envelope, retrieve the URL and initialize my HTML element (following this documentation: https://developers.docusign.com/docs/esign-rest-api/esign101/concepts/embedding/#docusign-js).

The signature process works correctly.

However, I'd like to add a verification of the signer's identity by sending him an SMS.

So I added the "RecipientIdentityVerification" object in my PHP.

Now I have an error in my console: Content-Security-Policy: The page parameters have prevented the loading of a resource at https://verify-d.docusign.net/App/Callback ("frame-src").

I've tried modifying the content security policy by adding frame-src 'self' *.docusign.net but it doesn't change anything.

However, when I open the URL returned by Docusign in a new tab of my browser, I'm redirected to https://verify-d.docusign.net/App/Callback to receive my code by SMS and sign it.

Do you know where this is coming from?

Thank you for your answers