Check this post. The black overlay could be causing the issue in your case.
https://forum.playcanvas.com/t/solved-black-overlay-when-tapping-on-the-screen-in-ios-10-3-2-safari/4203
Check this post. The black overlay could be causing the issue in your case.
https://forum.playcanvas.com/t/solved-black-overlay-when-tapping-on-the-screen-in-ios-10-3-2-safari/4203