| 400 | BUSINESS_CONNECTION_NOT_ALLOWED | This method was invoked over a business connection using invokeWithBusinessConnection, but either (1) we're a user, and users cannot invoke methods over a business connection; (2) we're a bot, but business mode was disabled in @botfather or (3); we're a bot, but this method cannot be invoked over a business connection. |
| 400 | CHANNEL_INVALID | The provided channel is invalid. |
| 400 | TOPIC_CLOSE_SEPARATELY | The close flag cannot be provided together with any of the other flags. |
| 400 | TOPIC_NOT_MODIFIED | The updated topic info is equal to the current topic info, nothing was changed. |
| 401 | AUTH_KEY_UNREGISTERED | The specified authorization key is not registered in the system (for example, a PFS temporary key has expired). |