Friendly URLs for participant and team pages are enabled within the event. When a participant is registering or trying to add a friendly URL for their participant page or team page (for captains), they receive the message: URL is in use. Please select another.
This is typically a result of the Friendly URL already being used by another participant or team.
Another reason this could occur is in this scenario:
A participant attempts to register and enters their friendly URL at the time of registration. The registration fails for various reasons. It is possible, even though the registration failed, that the Friendly URL is unavailable.