I was trying to add my phone as a Recovery Phone and upon submission of the verification code on the website, I get an error 500 "This page isn't working".
This is what I did:
Clicked Account Settings --> Clicked Update Phone (Under SMS Account Recovery) --> Clicked Add Number --> [Entered Master Pass] --> Clicked Continue --> [Entered my Phone Number] --> Clicked Send Test Code -->
--> [Entered Test Code] --> Clicked Verify --> Error 500: "This Page isn't Working".
I am doing this on Chrome: Version 63.0.3239.132 (Official Build) (64-bit).