Embedded players won't go full screen

When I embed a player in a course, welcome or course page, using an iframe, the full screen option never works.

I've copied embeds from Adilo and now from Bunny Stream.

The iframe allows for fullscreen but when clicking on the fullscreen icon - it never works.

Here's an example of the iframe from Bunny Stream that I'm using.

< iframe src="" loading="lazy" style="border:0;position:absolute;top:0;height:100%;width:100%;" allow="accelerometer;gyroscope;autoplay;encrypted-media;picture-in-picture;fullscreen;" allowfullscreen="true">

Everything else works, even picture-in-picture but not the fullscreen.