mark_chat_unread()¶ Client.mark_chat_unread()¶ Mark a chat as unread. Usable by Users Bots Parameters:¶ chat_id (int | str) – Unique identifier (int) or username (str) of the target chat. You can also use chat public link in form of t.me/<username> (str). Returns:¶ bool – On success, True is returned.