Telegram not working

Configuration
8

look at my example above. you are missing numbers.
so your configuration.yaml should be:

telegram_bot:
  - platform: polling
    api_key: 977862175:AAHsyg_iLJh9O0ueskRX0x2126D7eNecbaA
    allowed_chat_ids:
      - 977862175
      - 994600999