Salesforce CTI integration fails to load iframe due to X-Frame-Options restriction

Hello,

We are trying to integrate Zoom Phone with Salesforce using the Zoom for Salesforce Lightning CTI adapter.

Current configuration:

• CTI Adapter URL: https://zoom.us/lightning/zoomphone/lightning.app
• Permissions sets assigned (Zoom Phone User)
• Zoom Marketplace app authorized
• Phone number assigned and active
• User email address matches between Salesforce and Zoom
• Clickjack protection disabled on Salesforce

Issue:

When opening the Phone component, we get the following error:

Refused to display 'https://zoom.us/' in a frame because it set 'X-Frame-Options' to 'sameorigin'.

Additionally, there is a 404 error:

Failed to load resource: the server responded with a status of 404

Question:

Does this require any special configuration or account-level activation on the Zoom side to allow iframe embedding for Salesforce CTI? Could you please advise the next steps to resolve this?

Thank you.