Change your hub so it is not keyed off of user name, but username + email address.
My username is taken (which is expected, but not from my domain/email address).
AdminInfinit (Admin, Infinit) commented
Hey, we chose a unique username because we want it to be dead simple to invite someone to join a network / drive with a handle (like Twitter for example).
Péter “grin” Gervai commented
Or a simple unique hash/id, actually...