I have built a Smart Home skill in which everything works smoothly, from enabling the skill to device discovery. However, on some devices or accounts, the skill does not get enabled at all, and the /oauth/token endpoint is never hit. The flow only goes up to the redirect, and then it returns back to the Alexa app where the “Enable to Use” button appears again.

This issue seems to be account-specific. For example, in my real scenario, the Alexa app on my Android phone is logged in with my own account, and I can enable the skill and complete discovery without any issues. But when I log in with another user’s Alexa account (in some cases), the skill does not get enabled at all.

I want to understand how to debug this and what the main root cause could be.