[Python] Issues with Using `--extra-index-url` in `uv` with Google Cloud Artifact Registry

I'm trying to create a uv project that uses an --extra-index-url with Google Cloud Artifact Registry. According to the uv documentation, this should be possible. I am using uv 0.4.18. Here's what I've tried so far:

gcloud auth application-default login --project ${PROJECT_ID}
uv venv
source .venv/bin/activate
uv pip install keyring keyrings.google-artifactregistry-auth
uv pip install --keyring-provider subprocess ${MY_PACKAGE} --extra-index-url https://${REGION}-python.pkg.dev/${PROJECT_ID}/${REPOSITORY_ID}/simple


However, it returns an error indicating that my package can't be found. Interestingly, when I use standard Python, I can install my private package without any issues. Here's the code that works:

gcloud auth application-default login --project ${PROJECT_ID}
python -m venv .venv
source .venv/bin/activate
pip install keyring keyrings.google-artifactregistry-auth
pip install ${MY_PACKAGE} --extra-index-url https://${REGION}-python.pkg.dev/${PROJECT_ID}/${REPOSITORY_ID}/simple


It seems like others have faced this issue before, as mentioned in this closed GitHub issue. Has anyone else encountered this problem or found a workaround? Any help would be appreciated!

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