I think it's problem of ap v0.0.129 updated last week.
I exactly have the same poblem.
Can't start/stop cooking from the app. Can't set the temperature and time via the app.
Definitely anova is connected through wifi as my app can read the current temperature and manually set temperature via the app.
I think it's Monday morning in US.
So Anova team please read this thread and start to fix this problem asap.