{
  "id": "bot.not_member",
  "category": "access",
  "summary": "The bot lacks the chat membership required for this operation.",
  "match_any": [
    {
      "error_code": 403,
      "description_exact": "Forbidden: bot is not a member of the group chat"
    },
    {
      "error_code": 403,
      "description_exact": "Forbidden: bot is not a member of the supergroup chat"
    },
    {
      "error_code": 403,
      "description_exact": "Forbidden: bot is not a member of the channel chat"
    }
  ],
  "scope": {
    "method_examples": [
      "sendMessage",
      "deleteMessage"
    ],
    "exhaustive": false
  },
  "possible_causes": [
    "The bot has left an active group.",
    "The bot is not a member of a supergroup or channel and the requested access requires membership."
  ],
  "diagnostic_limits": "Membership requirements depend on the chat type, public access, and operation. This is separate from the explicit kicked response.",
  "evidence": [
    {
      "source": "server-10.3",
      "path": "telegram-bot-api/Client.cpp",
      "lines": [
        8835,
        8836
      ],
      "note": "An active group with a departed bot fails edit or write access."
    },
    {
      "source": "server-10.3",
      "path": "telegram-bot-api/Client.cpp",
      "lines": [
        8850,
        8856
      ],
      "note": "Public visibility and requested access determine whether supergroup or channel membership is required."
    },
    {
      "source": "server-10.3",
      "path": "telegram-bot-api/Client.cpp",
      "lines": [
        9045,
        9055
      ],
      "note": "Banned, left, and restricted nonmember statuses do not count as membership."
    }
  ],
  "example": {
    "method": "sendMessage",
    "response": {
      "ok": false,
      "error_code": 403,
      "description": "Forbidden: bot is not a member of the group chat"
    }
  },
  "evidence_level": "source_derived",
  "guidance": {
    "action": "restore_bot_membership",
    "repeat_request": "after_access_change",
    "preconditions": [
      "Add or rejoin the bot with the required access through an authorized chat administrator before resuming."
    ]
  }
}