| 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_PRIVATE | You haven't joined this channel/supergroup. |
| 400 | CHANNELS_ADMIN_PUBLIC_TOO_MUCH | You're admin of too many public channels, make some channels private to change the username of this channel. |
| 400 | CHAT_ADMIN_REQUIRED | You must be an admin in this chat to do this. |
| 400 | CHAT_MEMBER_ADD_FAILED | Could not add participants. |
| 400 | INPUT_USER_DEACTIVATED | The specified user was deleted. |
| 400 | PASSWORD_HASH_INVALID | The provided password hash is invalid. |
| 400 | PASSWORD_MISSING | You must enable 2FA before executing this operation. |
| 400 | PASSWORD_TOO_FRESH_%d | The password was modified less than 24 hours ago, try again in %d seconds. |
| 400 | SESSION_TOO_FRESH_%d | This session was created less than 24 hours ago, try again in %d seconds. |
| 400 | SRP_ID_INVALID | Invalid SRP ID provided. |
| 400 | USER_NOT_MUTUAL_CONTACT | The provided user is not a mutual contact. |
| 400 | USERS_TOO_MUCH | The maximum number of users has been exceeded (to create a chat, for example). |
| 401 | AUTH_KEY_UNREGISTERED | The specified authorization key is not registered in the system (for example, a PFS temporary key has expired). |
| 403 | USER_CHANNELS_TOO_MUCH | One of the users you tried to add is already in too many channels/supergroups. |
| 403 | USER_PRIVACY_RESTRICTED | The user's privacy settings do not allow you to do this. |