Update: Changing "Xbox One/Windows 10 Online Safety" settings on the xbox.com site caused the problem to resurface. So I don't know if it was the gamertag after all, possibly just updating the file caused the app to revisit the configuration in some way?
Ert Dredge
Update: Changing "Xbox One/Windows 10 Online Safety" settings on the xbox.com site caused the problem to resurface. So I don't know if it was the gamertag after all, possibly just updating the file caused the app to revisit the configuration in some way?