Alexa - having trouble understanding right now

Hello

I m having an issue with my Sonos one / Alexa
whenever I say Alexa
it says I m having issue understaning right now

it used to work but had to make some changes on my amazon account ( changes made by amazon support )
since then I can no longer control my sonos one using ALexa

I deregistered my sonos and tried to register again

skills is enabled
device is discovered

on my Alexa app I can see a sonos one that I cannot unregister