Undo "forget device"

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I accidently hit the "forget device" button on the "connect my device" page. Spotify forgot my Google Home (chromecast audio), and now I cant find any way to connect to it again. I need help to undo the "forget device". I have tried to log out and in, to uninstall and install the spotify app again, to factory reset my google home and to unlink and link my spotify account to google home. When I use my wife's spotify account, everything works like it should. Any suggestions for a solution to this?