Internal Server Error when running bracket

[Gegreenpeaced]

Hi, I tried deploying Bracket on my vServer.

This is my docker-compose.yml:
`services:
bracket-frontend:
image: ghcr.io/evroon/bracket-frontend
container_name: bracket-frontend
ports:
- "8430:3000"
environment:
NODE_ENV: "development"
VITE_API_BASE_URL: "http://bracket.norku.de:8400"
VITE_HCAPTCHA_SITE_KEY: "10000000-ffff-ffff-ffff-000000000001"
restart: unless-stopped

bracket-backend:
    image: ghcr.io/evroon/bracket-backend
    container_name: bracket-backend
    ports:
        - "8400:8400"
    environment:
        ENVIRONMENT: "PRODUCTION"
        PG_DSN: "postgresql://bracket_prod_admin:bracket_prod_pw@bracket-postgres:5432/bracket_prod_db"
        CORS_ORIGINS: http://bracket.norku.de
        JWT_SECRET: 4c5976a1903716fa9723df233a3ccb28792c7a22f9a25b1174b152d2e65cd381
        ADMIN_EMAIL: "test@norku.de"
        ADMIN_PASSWORD: "supersecretnottheactualpasswordthatiwillnotleak"
        ALLOW_USER_REGISTRATION: false
        ALLOW_INSECURE_HTTP_SSO: true
    volumes:
        - ./backend/static:/app/static
    restart: unless-stopped
    depends_on:
      - postgres

postgres:
    image: postgres
    container_name: bracket-postgres
    ports:
        - "8432:5432"
    restart: always
    environment:
      POSTGRES_DB: bracket_prod_db
      POSTGRES_USER: bracket_prod_admin
      POSTGRES_PASSWORD: supersecretnottheactualpasswordthatiwillnotleak
    volumes:
      - ./postgres:/var/lib/postgresql`

All containers deploy and i get no errors. When I want to login on the page i get this message:

The Web-JS-Debugger is suggesting that it wants some kind of "token" on a localhost url? wtf?

(Firefox cites this page: https://developer.mozilla.org/de/docs/Web/HTTP/Guides/CORS/Errors/CORSDidNotSucceed?utm_source=devtools&utm_medium=firefox-cors-errors&utm_campaign=default)

Maybe I'm just supid but I can't figure this out. Help would be very appreciated.