I've communicated with Anova support 3 times. So far I cannot connect to the oven; I've deleted the app, reinstalled, turned off bluetooth, etc. etc. without success.
Edited to add that we've recently upgraded our internet service to fibre optic.
The top of Anova Precision Oven wifi troubleshooting page states
"To successfully connect your Oven to the Anova app, ensure you’re connected to a 2.4 GHZ wifi and not through a 5 GHZ wifi. The Oven will only be able to connect to a 2.4 GHZ wifi. "