Xiaomi cube not responding yet showing in home assistant

I have the same issue and I think it is linked to the cube you are using. There are two cubes. The old one which works says Mi on it and the new one with troubles says Aquara on it. See this post for pics.

In 0.70.0 they added the new cube so it shows up, but it doesn’t look like there is any communication yet. There is an issue out on this though and it seems there may be a solution in the future.