Ok, CEC (T-Link) was disabled in my TV settings.
Then the pairing eventually worked one time out of the many times I tried it.
Btw, it didn’t worked going in settings, sound & images then pairing
BUT I pressed the home button and selected pairing in the recent used settings just at the bottom. Otherwise it didn’t worked :/
Now all is working fine 🙂
Thanks for your help adrianlondon