Git checkout: Error: fatal: repository not found (private repo)

Anyone else getting this? This just started yesterday evening and still getting it. The repository does exist and this flow used to work fine earlier in the day.

      - name: "Checkout"
        uses: actions/checkout@v2
          fetch-depth: 0
      - run: |
          git checkout ${{ github.event.inputs.ref }}

 Error: fatal: repository '' not found
  The process '/usr/bin/git' failed with exit code 128
  Waiting 12 seconds before trying again
  /usr/bin/git -c protocol.version=2 fetch --prune --progress --no-recurse-submodules origin +refs/heads/*:refs/


We have had a few users report this issue with actions/checkout and private repositories, and our team is currently investigating.

We recommend following along in this issue for updates: