Alexa skill not discovering any devices

/!\ UPDATED

Hi There, same king of issue here.

I followed the same step-by-step (Amazon Alexa Smart Home Skill - Home Assistant).
My lambda function works (with Long Term Access Token) so my HomeAssistant instance is up and accessible.
My Alexa Skill is available form the Alexa app and I can connect to my HA instance.

But Alexa does not find any new device. I don’t understand why…
Any idea ?

UPDATE

Reading this post : Alexa integration does not find devices? - #4 by petro I checked the regions and the US vs EU servers.
I speak French (in North America), my Alexa is fr-FR Locale.

But I force the Virginia server and all devices are now discovered…

TLDR : check the regions and stay constant