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 work.

git add .
git commit -m 'Init'

I thought it was a conflict of "git init" creating master branch and github's (new) "main".

After:

git add .
git commit -m "first commit" 

I was able to git branch -M main

You can change the name from master to main in few steps, locally before you even make a commit.

1. Navigate to the directory where your project sits.
2. In it, show hidden file since by default, .git would be hidden.
3. Inside .git, there is a file, HEAD, open it in a text editor. You'd see, ref: refs/heads/master.
4. Simple enough, change, master to main.

We just renamed the master branch as main. Verify this merely by entering, git branch from the terminal.

First set your email and username config using:

git config --global user.email “”
git config --global user.name “Your Name”

Then add your files:

git add .

Then make your first commit :

git commit -m "Initial commit"

And now run the command :

git branch -M main

It worked for me this way.

My guess is that you're not on a branch named "(no branch)", but rather not on a branch.

If you first checkout master:

git checkout master

and then create a new branch:

git checkout -b new_branch

that would make it look like you'd expect.

I also got that error but I fixed it with: git commit -m"your commit" before : git branch -M main and it worked correctly

Try this:

1. git config --global user.email “your-email”

2. git config --global user.name “your-username”

3. git commit -m "TypeScript React using Tailwind"

4. git branch -M main

5. git push -u origin main

it must work! :)