Hi @AlbericoD,
Today I have moved on a little bit, so solved JWT error issue. But stuck on other thing.
So when my extension is loaded (in online mode, testing on localhost) in developer rig, my extension view is not loading. When I look at network tab I see this,
POST https://api.twitch.tv/v5/extensions/my_extn_client_id/auth/refresh/999999999
is giving 404.
Can you help me with this?