Why doesn't sending a message to a group using the telegram bot work?

Question

Messengers

Hello!
I send messages using a bot, it sends users without problems, but there is no group. group id is present (with a minus).
https://api.telegram.org/bot[bot]/sendMessage?disa...
But the error is reported:
{"ok":false,"error_code":400,"description":"Bad Request: chat not found "}
What's wrong?

Answer 1

Maybe someone will help. Telegram throws this error when the bot is not added to the chat on chats or if you simply did not write to the bot

Answer 2

https://core.telegram.org/api/errors