Shelly Plus 1 not identified by the App

Hi guys.

Please excuse me for my bad english

I have two Shelly Plus 1. One of them works flawless. The other one works only by the web-UI on the browser. The Shelly Cloud App doesn't identify it to adding it, and also the Home Assistant Shelly integration doesn't identify it with the IP. I've tried:

- 2 different wifi networks: no results

- 2 different routers: no results

- static/dynamic IP: no results

- 0.7-0.8-0.9 beta firmware: no results

- many soft/hard resets: no results

- to enable the cloud in the web-UI, but the Shelly says that it is not possible

Nothing, it's always the same story, the first one works perfectly and the second one doesn't work.

Can you help me?

Oh, I'm sorry, I forgot to mention this.

Yes, I did it, I tried both Apps, the standard one and the beta one, with no results

Has anyone any idea about my problem?

I can bypass the app, but I need that HomeAssistant can identify the rele