We are seeing the same issue: https://github.com/justinchuby/barometer-project/issues/8.
Looks like CMAltimeter.authorizationStatus() shows notDetermined, and I have not found a good way to request this authorization.
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After installing hdf5 with homebrew, I needed to set the two env vars before pip3 install h5py:
export HDF5_DIR="/opt/homebrew/Cellar/hdf5/1.13.0/"
export CPATH="/opt/homebrew/include/"
where 1.13.0 is the version of hdf5 installed.
A discussion is also happening on https://forums.developer.apple.com/thread/125690
I also needed to connect my iPhone using a cable.