What is the jurisprudential ruling concerning the permissibility of one person performing istikhara (seeking guidance from God) on behalf of another, taking into consideration the divergence between your fatwa which deems it impermissible and another fatwa which permits it based on the hadith: "Whoever among you can benefit his brother, let him do so"?

The default is for a person to perform istikhara (seeking guidance from Allah) for themselves, as stated in the Hadith (definition) of Istikhara, and this is what some scholars have favored. However, some have permitted performing it on behalf of another, citing the hadith: "Whoever among you can benefit his brother, let him do so." Others hold that the apparent meaning of the Hadith of Istikhara necessitates that a person should not perform istikhara for someone else.