Triggering dispatch job through github app

[shane-at-algo]

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Hi ,

I'm attempting to trigger a job in another private repository using a github app.
The code itself is something simple but doesn't appear to work

steps:
      - uses: actions/create-github-app-token@v1
        id: app-token
        with:
          app-id: ${{ secrets.BOT_ID }}
          private-key: ${{ secrets.BOT_SK }}
      - name: Trigger documentation build
        run: |
          # Set environment based on branch
          if [[ "${{ github.ref }}" == "refs/heads/master" ]]; then
            ENV="production"
          else
            ENV="staging"
          fi
          
          # Trigger repository_dispatch event
          curl -X POST \
            -H "Authorization: Bearer ${{ steps.app-token.outputs.token }}" \
            -H "Accept: application/vnd.github.v3+json" \
            -d "{\"event_type\": \"docs_update\", \"client_payload\": {\"ref\": \"${{ github.ref }}\", \"environment\": \"$ENV\"}}" \
            https://api.github.com/repos/ORG/REPO/dispatches

However it would fail with the following message

{
  "message": "Not Found",
  "documentation_url": "https://docs.github.com/rest/repos/repos#create-a-repository-dispatch-event",
  "status": "404"
}

The app is installed on both repos and should have the correct permissions.
It's definitely a github app permission issue since I can run the came code with a PAT and it will work.

In frustration I created a new github app , with FULL read-write and admin permissions. But that also doesn't work.
Is there anything that can be done to debug what is missing for this to work ?

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