Security profile is not allowing http://stvs4a/grant_me to be saved reports error One or more of the Allowed Return URLs is invalid.

[APati.8]

I am trying to build Alexa build in device on X-CUBE-VS4A runs on the 32F769IDISCOVERY board.

I have registered this as a new product under my Amazon account and need return URL example (http://stvs4a/grant_me) details Which I can enter under Amazon security profile to get the token. 

Security profile is not allowing http://stvs4a/grant_me to be saved reports error One or more of the Allowed Return URLs is invalid.