To my knowledge, none of the municipal bans have been challenged, so that's a quick answer in that regard.
One thing I can add regarding this is about something that happened in the Vancouver ban when it was passed. I helped draft that bylaw. The City of Vancouver decided to write it for minors because of their fear that it could be challenged in court. I spoke at that chamber hearing. I was so delighted when one of the city councillors spoke up and said that we need to make an amendment to the bylaw and make it for all people regardless, because virtually every health organization globally has denounced these treatments as unethical, fraudulent and harmful, and if anyone were to challenge this bylaw in court, we would have the world stage at our defence. The entire city council unanimously passed that amendment and Vancouver's bylaw was for adults, for all.
To my knowledge, there have been no challenges.