Hi, @JackB. I believe the issue in this case is that this step is being skipped:
┌────────────────────────────────────────────────────────────────────────┐
│ │
│ Run this command to use Netlify Large Media in your current shell │
│ │
│ source /Users/jack/Library/Preferences/netlify/helper/path.zsh.inc │
│ │
└────────────────────────────────────────────────────────────────────────┘
Because that command isn’t being run, the current shell doesn’t know about the Git credential helper. Would you please test running that command and let us know if it resolves the issue or not?
Note, that line should also be added automatically by the netlify lm:install command to the file .zshrc in your home directory as well. I recommend double checking that as well to confirm it is happening.
If you still see the error, we’ll be here to keep troubleshooting.