Connecting edenwood with alexa

Hello,

having had an internet box issue, my devices and my Alexa could no longer use the wifi to connect to the TV.
New box received, everything is okay except my Alexa, impossible.
Either I'm forgetting a procedure, or there's an issue beyond my control.

I install Alexa, activate wireless display on the TV, I connect to wifi.
My phone is on the same wifi, I've split my band to 2.4 GHz.

I install the smart center skill on Amazon.
And the Edenwood TV skill on Android, Alexa app.

Then on the TV, I go to voice assistant, works with Alexa, it made me validate a code, then it asks for a friendly name, and I name it TV and then I get a message saying

registration failed, please return to settings>system>network>voice assistant>works with Alexa.

And I keep retrying with different names, even my name Google, Amazon or just television, nothing works.

Does anyone know where the problem might come from?

thank you