ISC-007BW thermometer - No data on graph

Basically what the title says. App is not recording data on graph so I can’t see data at all except for live data. I’m on iPhone in the app and have tried resetting multiple times right next to the router

May I know are you using WIFI to connect?
Please re-enter the chart, will it work?
If not, please provide your country, mobile phone model and ISC-007BW device ID to email