Hello, I don't have any more information with the mobile application, locally I only have the values but not the diagrams my S/N. If I request a new connection the system says s/n already taken. Thank you for your help and happy new year

Please do not post your SN in a public forum. I will hide your sn later.

Have you configure the Wifi like this before

https://www.iammeter.com/quickstart/wem3080t-quickstart#32-set-up-in-the-browser

Whether the wifi LED is on ?