Is the marriage of GISB Holdings members valid when it uses a self-appointed guardian judge or the Aurad Muhammadiyah recitation as dowry?

Summary

A guardian judge (wali hakim) appointed by GISBH itself is not a valid one, so such a marriage is a marriage without a guardian. It is fasid according to the majority of scholars and the contract must be repeated with a valid guardian. An exception applies to marriages abroad in a non-Islamic state where the guardian is appointed by the local Muslim organisation or community, and children born of these marriages may have their lineage established for their welfare. The Aurad Muhammadiyah dowry is not recognised and must be replaced with the equivalent dowry (mahar mithil), while a marriage that fulfils the pillars remains valid.

Written in our own words from the original fatwa — check the source before acting on it.