I had the same issue using Brave and investigated it a bit. Apparently, it seems to be an issue of Brave at the moment, when trying to open Unity games based on WebGL 2. There are a lot of people reporting this issue. I installed Chrome and added HIVE Keychain and it worked right away.
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probe en 4 navegadores , chrome , brave , edge y firefox, todos con hive keychain y no funciono en ninguno
I didn't have a problem with it using brave on an Ubuntu based distro which is a snap package that updates regularly.