How can I re-register my phone with WhatsApp two-step verification?

[Android Central Question]

For the past several days, I can't make any calls on WhatsApp (although I am connected and can send messages). When I try to make a call, I get a message saying:

> Can't place call because this number is no longer registered on WhatsApp

So, I go to my account settings, and in "Two step Verification" it says:

> For added security, enable two-step verification, which will require a PIN when registering your phone number with WhatsApp again.

So I guess I need to re-register my phone. But how? If I try "change number", it won't accept the same number, it has to be a different one. Except I don't have a different number to use. And I definitely do not want to delete my account...

What do I do?

Relevant Details:
**Phone:** Xiaomi Redmi 3S
**Android version:** 6.0.1 (MIUI build 8.5.4.0)
**WhatsApp version:** 2.17.427

 

[einpoklum]

(This is my question, I should have registered before asking...)

 

[A Bochur]

when it says "this number" it means the number you are trying to call, and not that your own number is not registered