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I get into this issue too. The reason is that I didn't have any commit on this
git repository.
When I run the command git branch -M main. I get the following error message.
error: refname refs/heads/master not found
fatal: Branch rename failed
After I add my first commit by the following command, all things works.
git add .
git commit -m 'Init'
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error: refname refs/heads/HEAD not found
fatal: Branch rename failed
$ git checkout -b main
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//make sure everything is commited before
git add .
git commit -m 'Init'