I know I'm late to this but I just got my fridge two days ago. Everything worked fine signing in and then I had the same cannot connect to server message. Being the stubborn person I am, I deleted and redownloaded the app, it still didn't work. Frustrated I was just going to delete the app and when you press and hold to delete there was the option to "view inside". Just out of curiosity I pushed it and it popped up with the same gathering family info, but then glitched for a second and popped right open. I thought maybe it was an accident so tried it on my husband's phone too (also an iPhone running IOS 13) and it worked for his phone as well. Haven't had a problem since. Hopefully this works for you if your app is still down.
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