Support keeps rejecting twitter card which follows guidelines, I see no issue


Help, your support guys keep telling me they have a browser issue with my player card iframe but it works perfectly on my end!
It follows all guidelines and I replace youtube’s card iframe src with mine and there are no issues… please be more specific!
This is the test URL I am validating:
This is the iframe url:[autoPlay]=false

Again, it follows all the guidelines I can see, and when I replace youtube’s player cards iframe src with mine, it works perfectly?

What issue are you seeing, exactly? How do I reproduce it? How do I fix it? Everything seems fine on my end! I am following the guidelines! I am going crazy here! Please help!