I know this question has been asked before, but in the answers it has been stated that the issue has been fixed. However, it is still occurring for me. After enabling account linking successfully for my skill and it working perfectly, after turning off my workstation for a day and logging back into Amazon, the access token is now not being passed in the Lambda request at all. I have to re-link the skill manually for it to work again, even though Alexa still claims that the account is linked properly. With authorization grant, isn't Amazon supposed to save a refresh token that gets a new access token whenever it expires?