nenainstaloval si si nahodou devel verziu?
https://github.com/signalapp/Signal-Desktop/blob/5c66c3ddc89b2dcb4ea0cf0861b5d25726a2b4c3/CONTRIBUTING.md

"By default the application will connect to the staging servers, which means that you will not be able to link it with your primary mobile device."

Mal by si nainstalovat normalnu, ak chces fakt pripojit s tymto na prod:
https://github.com/signalapp/Signal-Desktop/blob/5c66c3ddc89b2dcb4ea0cf0861b5d25726a2b4c3/CONTRIBUTING.md#testing-production-builds