I have good certificate from comodo, https A+ secure website that sends right data to redirect_uri (https://pitangui.amazon.com/api/skill/link/XXXXXXXXX), but all the time I see this (An error occurred while attempting to link Alexa with the external provider) error. In access log of my website I see only one request to /api/oauth2/authorize endpoint (that I wrote in Authorization URL section).
What i should do with this? How I can understand the reason of this behavior?
P.S.: I've read most of all topics here about that problem