I had the exact same issue with my family accounts, when I tried to start games in Chrome. Then I added the family accounts to my Chromecast, and now everything works perfectly, on both Chromecast a...
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I had the exact same issue with my family accounts, when I tried to start games in Chrome. Then I added the family accounts to my Chromecast, and now everything works perfectly, on both Chromecast and Chrome. Hope this might help you and others too...until a proper fix is released @ChrisFromGoogle