Far from a game breaking bug thankfully. However if you go to change your subdomain for whatever reason using the cut and paste method from Ready Player Me Studio and posting it into the project settings it will cause an error. what the field wants would be “madeup” not https:/madeup.readyplayer.me?frameApi as the copy would give you.
Hi and welcome to the Forum!
This is not a bug. The reason why it copies the full URL is because it can be used directly in the web browser. The setting window itself shows: https// yoursubdomain .readyplayer.me and leaves only your subdomain part to be filled.
However, we understand that it could be confusing and we will look into if we can explain this better in our documentation in the future. Thank you for the feedback and a good tip to fellow developers in the Forum.