In release r157+ the touch event is not fired if the game is inside of an iframe on IOS (tested on iPhone and iPad with v12.3 and v12.4)
You can test here:
Works as expected with r148
hello dabontv, did you file a bug report?
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It looks like this issue which has already been fixed. (As ever it's best to post bugs to the bug tracker, they're not dealt with on the forum)