Sony xbr-75x9008 Tv will not mirror my iPhone 11 pro

I was able to mirror my iPhone 11 Pro with my Sony xbr-75x9008 to watch the Apple TV app, HBO max, and paramount + until this past weekend. When trying to connect, the screen says” this video is in a format that cannot be streamed to this tv.” After working with Genius Bar for 2 hours last night, it was determined by them that it was not an iPhone problem but rather a tv problem. The iPhone and tv use the same wifi and the tv was rebooted. I was just wondering if anyone else has had this problem. If so, will you please share with me what you did to fix it.