Catch XHR query from iframe tag

I have some.php page, where iframe located. This iframe is an embedded code from calendly service. After the user has submitted a form inside this iframe – this iframe is making some ajax xhr request and returning the result inside of this iframe.

This result is containing manager name, which was fixed at the appointed meeting. I want to get that name. All I have is an ID of the meeting. API does not provide any functionality for getting manager name by given meeting ID, they just return information about the client.

The thing is – I can see this request (invitees) in the Devtools -> Network:

Network

But I cannot catch it, because it’s inside the iframe.

Are there any walkarounds me to the get this response?