With the latest 0.4.0 go run github.com/alexzorin/authy/...@latest on Linux:
I'm entering 49 as country code and the exact number as shown in Authy's My Account Cellphone Number, without the '-' characters (and any leading 0)
Device registration failed: There doesn't seem to be an Authy account attached to that phone number
Anyone succeeded with this for non US cellphone numbers?