Why is the site not displayed in iframe?

Question

Nginx

Good afternoon!
Such a question on the server of the site inserted into the iframe was prescribed X-Frame-Options allow
But there is a problem, as I understand it, the service worker overwrites the header and instead of allow it sets
someorigin work in the widget. How to solve the problem? https://monosnap.com/file/M2x0cL0oUy4tolDVOtnqn7y2...