I need clarification on the following report : some people report that the tashahhud originated from mi’raj ie it was a conversation between Allah the Exalted, His Prophet (‘alayhis salam) and the Angels. You provided proofs in fatwa #28277 albeit from secondary sources. Now there are ‘ulamas and muhaditheen who say there is no known sanad for this and no authentic hadith book contains this narration (see for example this link).
For sure the ‘Ulama you quoted were inspiring figures of Islam, but I am uneasy spreading a narration that may not have any sanad going back to the Prophet (‘alayhis salam) just by using an argument of authority.
Can you please shed some light on this. Jazakumullahu kheyran.
In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
Some scholars have mentioned the incident in reference without its chain of transmission. However, we were unable to locate it in any primary source of Hadīth. In this regard, ‘Allāmah Anwar Shāh Kashmīrī writes, “I have not come the chain of transmission for this narration. It (i.e. the incident) is mentioned in al-Rawd al-Unuf.” It should be noted that ‘Allāmah ‘Abd al-Rahmān al-Suhaylī in al-Rawd al-Unuf also does not mention the chain of transmission.  Accordingly, until the chain of transmission is not located and examined, it would be advised not to quote the incident.
And Allah Ta’āla Knows Best
Student Darul Iftaa
Checked and Approved by,
Mufti Ebrahim Desai.