Hello @Yiannis_Kouropalatis,
Yes, something funny going on. I have just tried adding that station via tunein and that has failed too. At the moment I don’t know why.
However, I have added Pepper 96.6 as a station in the live radio section. If you search you should find it. It works for me.
Can you let me know of your other problem stations please? I’ll try and fix them the same way and we can sidestep Tunein (although I do note that the link ought to work).
As this seems to be a station issue rather than your setup, I have moved your post over to the #live-radio area.