The issue still exists. The reason is that XIaomi changed their login API.
The issue has been discussed here : Log in to the Xiaomi Miio cloud failed with correct credentials · Issue #58991 · home-assistant/core · GitHub
And here (library used by the integration) : login failed with "Unknown exception occurred!" · Issue #6 · Squachen/micloud · GitHub
The issue still hasn’t been solved on the library used, so the Xiaomi Home integration won’t work. Until someone fixes it.