Few months ago I created my own Alexa Developer Skill according to guides in
Amazon Alexa - Home Assistant (home-assistant.io)
Two days ago the skill stopped working: Echo Dot told me to disable and re-enable the skill in Alexa App, I tried, but now I cannot link the account / enable the skill anymore: I receive the error message “cannot link the account” without any further hint.
This happened across night, without any significant change in the system. I also tried to restore the configuration from a backup of few days ago but was unsuccessful.
This happened also to another independent HA installation I manage.
Both installations were and are still accessible from outside with https thanks to Cloudflared tunnels if that can matters.
Not sure how I can diagnose further the issue. No hints in the logs.