When I request chat using @username, it return 400
But it works if I pass not my @userName but my userId.
Regarding to documentation I should obtain chat by userId OR by username: https://core.telegram.org/bots/api#getchat
1 write /start to your bot
2 request https://api.telegram.org/bot/getChat?chat_id=@yourUserName
Expected: get detailed info
Actual: "Bad Request: chat not found"