the yoetzet assured it over the phone ”
I know a Rov who did the same thing. They were both wrong to do that. We can debate this all night. There are rabbanim who don’t do their job, and there are women who are trained to do a job who also mess up. Guess what, people in ALL walks of life overstep their bounds, screw up, make poor judgment calls,and cause trouble. The problem is extra sensitive because of the nature of the responsibility these women are being given, and the objections that many men have to their being given it, despite the fact that it is being accepted by many authoritative figures as halachically proper.
(By the way, this is a case where the Hebrew word for forbidden is better spelled phonetically as “assered,” because “assured” could lead one to believe the exact opposite of what one is trying to convey. Just sayin’)…