بسم الله الرحمن الرحيم
[Ahmad al-Hassan says]: "The book of Al-Ghayba by Sheikh al-Toosi contains the only narrated text of the book preventing misguidance which the Messenger of Allah pbuhap wished to write [...]"
Response: The truth is that, the content of the "Will" of the Prophet (saw) has been mentioned in the book of Sulaym ibn Qays (ra), and nothing has been mentioned in it about ‘al-Mahdiyoon’ or ‘Ahmad al-Hassan’. This is a clear proof, that Ahmad al-Hassan is ignorant of the prophetic hadith and that he is a charlatan.
 Refer to the article: Ahmad al-Hassan - mentioned in the "Will"?