New Music Licensing now live on AudioJungle. Check it out
You should send 3 names, so they can choose one, or better check which one of these would be free on the marketplaces.
Send your 3 top names and be patient
May be ‘cause desired name could be already registered. Just think up 3 names and specify which of them you’d really want.
Also they asked you to write your current username in the reply, don’t forget )