Could the DAVx5 account settings please list the base URL that was used to create the account, next to the user name?
Account settings should display the URL
You know that you can lookup the url of a ressource by opening the 3-dots menu behind e.g. a calendar and choosing properties? That’s not exactly what you asking for but a workaround. I would assume that the base url is usually the part in front of the user name.