Trouble playing Pokémon Shield without WiFi connection ?

I have played Pokémon Shield since release so far with no issues. I paid for and downloaded it through the Nintendo eshop. I am currently travelling with no access to WiFi and am getting an error message when I try to launch the game. "Unable to connect to network device." I purchased this game to play offline. 

Update:

When I played the game prior to now I had been connected to WiFi at home. 

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