the Tablet cannot be authenticated at this time as neither an original manuscript nor an authenticated transcription of it is available.

Your email letter of 16 January 2022, together with its enclosure, in which you request a typescript of a Tablet of Bahá’u’lláh that you refer to as the Lawḥ-i-Jadhb as well as information about where it was revealed and the identity of the addressee, has been received at the Bahá’í World Centre. The delay in replying is regretted. The Research Department has previously reported that, while several manuscript copies of this work are held in the Archives at the World Centre, the Tablet cannot be authenticated at this time as neither an original manuscript nor an authenticated transcription of it is available. It is possible that, in the future, a reliable manuscript will come to light, which would enable that Department to confirm its authenticity.

(THE UNIVERSAL HOUSE OF JUSTICE, DEPARTMENT OF THE SECRETARIAT, 16 May 2022)

https://bahai-library.com/uhj_lawh-jadhb_not_authenticated