FYI Micromamba 2.0.2 appears to be broken on on macOS 15.1 Sequoia TLDR; My Solution remove micromamba 2.0.2 and use home brew install of 1.5.10

brew install micromamba

The errors appear in different ways, but almost always with regards to downloading or network operations.

critical libmamba Multiple errors occurred:
    Transfer finalized, status: 403 [<https://conda.anaconda.org/nodefaults/noarch/repodata.json>] 151 bytes
    Subdir conda-forge/noarch not loaded!
    Subdir nodefaults/noarch not loaded!

If you curl or use a browser the above url it works fine. Happy flowing

release of micromamba/mamba 2 has caused a flurry of issues…

For sure and strange ones at that. 🙂