Flash call never comes through

*For context: i have a newer decice but i am usign this as a spare and i* *an* *using viber because i dont really have any other free choice for voip calling since i dont have a voip number and 2g/3g cell reception has shut down where i live*

*New Viber activation*

You’re about to receive a call with an activation code.

The phone number is the activation code.

If you didn't request the call you can ignore it and report it here. https://reports.viber.com/Xlq\_lSxRPp

*Remember, NEVER share your activation code with anyone!*

Is the exact message i get on viber when i sign in on my other device which just pops uo with “continue to flash call approval” but yet no call ever comes through and the phone saying continue to flash call approval doesnt progress to the next screen asking for the last 4 digits of the phone number calling