I'm trying to create a new service in my Railway project using the GraphQL API (v2) through Postman, but I keep getting the following error response:

{
  "errors": [
    {
      "message": "Problem processing request",
      "traceId": "4634186857790866770"
    }
  ]
}

▶️ What I’m Doing

• Mutation: serviceCreate($input: ServiceCreateInput!)
• Tool: Postman (GraphQL tab)
• API Endpoint: https://backboard.railway.app/graphql/v2
• Auth: Bearer token in headers (fully working with other queries like me, teams, etc.)

🔧 GraphQL Mutation

mutation serviceCreate($input: ServiceCreateInput!) {
  serviceCreate(input: $input) {
    __typename
    id
    name
    projectId
    createdAt
    updatedAt
    deletedAt
    icon
    templateThreadSlug
  }
}

🧩 Variables

{
  "input": {
    "projectId": "d1909034-17dd-4603-9f3d-10b4496ad718",
    "name": "my-service",
    "source": {
      "type": "GITHUB",
      "github": {
        "repo": "ru-dr/yatrazen",
        "branch": "main",
        "rootDirectory": "/"
      }
    }
  }
}

✅ Things I’ve Already Checked

• The project ID is valid and created just before this step.
• GitHub repo ru-dr/yatrazen exists and is public.
• main branch exists and contains a basic Node project with package.json.
• Same token works for listing projects and teams.

🙋‍♂️ Context — What I’m Building

I’m building a platform for developers that lets users:

• Connect or upload their GitHub repositories
• Deploy them to Railway using my API backend
• Automatically get a deployment preview/production link

Basically, I want users to interact with Railway without going to the Railway dashboard.

To do this, I’m integrating with the Railway GraphQL Public API to:

1. Create a project
2. Create a service from a GitHub repo
3. Monitor deployments and fetch the deployment link