We use a site called SafeYouTube which is now VideoLink to create a URL that brings you to a YouTube video that is free of ads and safe for students.
VideoLink doesnt want to work with devices on iOS 13 or greater because Request Desktop Website is on by default within Safari's settings (which makes no sense since its a mobile device.)
There are ways to disable it within the URL such as pressing the aA icon in the upper left corner of the screen and choosing "Request Desktop Website" from the drop down box to toggle it off or on but we are dealing with Kindergarten students here.