Is this how I add GFCI and Regular Outlet to existing Multi Wire Branch Circuit, 20amp? 12/3 to 12/2 wiring with GFCI
The fact that it is a multiwire branch circuit may have been allowed in the past I don’t remember but think it may have been ok.
Today the laundry branch circuit is a required circuit and it is a dedicated circuit and can have no other receptacles so it would not be code compliant by today’s code or many code revisions back to add the GFCI receptacle even if properly wired.