Did not know that about the desktop app, thanks! I've been trying to get the web build to work properly but no luck so far.
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Unity web builds do have some technical limitations (see https://docs.unity3d.com/6000.0/Documentation/Manual/webgl-technical-overview.html - does your game contain any threads?), so chances are you might have encountered one of those problems. Still, I would suggest trying to make a linux build as well, as chances are there might be fewer technical problems with that.