Go to an avatar page like https://vrchat.com/home/avatar/avtr_8d0693ac-f178-45db-812e-4e08bc016756 then click on the share button and see what sort of URL you get.

I got https://vrchat.com/home/avatars/avtr_8d0693ac-f178-45db-812e-4e08bc016756 which currently loads a blank page