# Find the exact signing key Git is using
git config --get user.signingkey

# Reload the agent and restart pinentry
gpgconf --kill gpg-agent
gpgconf --launch gpg-agent

# Make sure the secret key is actually present
gpg --list-secret-keys --keyid-format=long

# Test signature in-place
echo "test" | gpg --clearsign

# If pinentry is missing on macOS:
brew install pinentry-mac
echo "pinentry-program /opt/homebrew/bin/pinentry-mac" >> ~/.gnupg/gpg-agent.conf
gpgconf --kill gpg-agent