View Source ExTDLib.Object.UpdateAddChatMembersPrivacyForbidden (ExTDLib v0.0.4)

Adding users to a chat has failed because of their privacy settings. An invite link can be shared with the users if appropriate.

NameTypeDescription
chat_idstringChat identifier.
user_idsstringIdentifiers of users, which weren't added because of their privacy settings.

More details on telegram's documentation.