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you need 2 Sonos ones to make the Sonos Ones rear speakers in a 5.0 setup. Do you have both.
Otherwise you can just group it.
First thing anyhow I would do is setup the Sonos one (go into settings if you haven't and ADD A PLAYER). Set them up as stand alone zones then you can go in and make them rears if you want ...think more reliable to setup that way).