Connect TERA account with Xbox?

I wanted to ask if I can connect my Tera account on the PC to my xbox, so I can play the game on PC and Xbox (like Fortnite)

No, these are 2 different "games" - above all, the scores are different.

On the X-box is a Tera version above, as the players have played them 2-3 years ago. So there are other dungeons etc on the PC than on the console. So you can't connect the games.