Here's an update from several previous posts.
On a hunch, since I think the classify fail issue is related to specific frequency tones being sounded but not responded to, I did another test in which I randomly and regularly pressed the response button, whether I heard a tone or not. And, for the first time in maybe 15 attempts, the left ear passed classification. I stopped the test since it was totally bogus. I then did another test the regular way. It failed as usual.
I'm curious. If you still are having hearing test failures, try my test of the test method. Start it and then press the button randomly and regularly, whether you hear tones or not. Please post your result. And, of course, stop the test of the test and reset, since it is not correct.