My skill was working for a long time. Since yesterday, after a reboot of the custom "Authorization server" (the server I created to validate login with the skill and which is used during the linking process), I tried to unlink/re-link my amazon account to my skill but it didn't worked (and still not).
I doesn't change anything in the code, just reboot the server.
I checked the server logs :
I can see Alexa login redirection, user successfully logged in and my server calling back Alexa service with the redirect link, the state value and the generated code.
But Alexa didn't call back my server to ask for a token (with the client and the generated code).
I don't know what's going on.
Any idea about any problem making Alexa stopping the linking process? Is there a way to test mys answers in alexa developper console (or any console)?
I use let's encrypt to generate my ssl certification (I use it since the beginning of the skill so I think it's not the problem).