Best guess is the eBay SB3 is still registered on MySB.com to it's
previous owner's MySB account.
If so, it must be deleted from that owners MySB account before you can
register it on your MySB account.
Two options to get that player deleted:
1. contact previous owner, he can delete player
Hi,
I've had my squeezebox classic for a few years, and recently discovered
the android app that controls it from anywhere in the house. A complete
game changer! So, I bought a second SB3 on eBay, hooked it up right out
of the box, and it works great... except on the new SB3, under the my
apps