Is your feature request related to a problem? Please describe.
Im running spotifyd on my router which is used to play music in my kitchen & I have a Spotify Duo account.
Before when using RPI and raspotify, both my and my GF (the other account on my Duo subscription) were seeing the RPI as a speaker in the "devices to connect and listen on".

Both raspotify and spotifyd are configured to use my account, but both accounts are linked by the Duo subsription.

I would love to have the same feature here, for both of us being able to use spotifyd as a shared spotify device for both accounts in Spotify Duo Subscription.

Describe the solution you'd like
Same solution that is in raspotify.