I think that would be great to have the flexibility to change "Custom URL" more than once before publishing!
I joined the community directly through a link to Skool Game a week ago, with zero knowledge about Skool. To join, I had to create a group with a name. I did that, but after a few days of exploring, I decided to switch to a different name and realized I could only change it once!
I made the change, but after going deeper into the community and learn more about the whole process, I realized I needed to change it again and that it wasn’t possible! It takes time to figure out which direction and path is right.
It seems fair to allow users the flexibility to change the name multiple times before publishing the group.