Client bug

Mine did this earlier after locking me out of the game I was in. Restarting the client and running the troubleshoot fix seemed to solve that issue. I was still locked out of game but as you aren’t just the full repair might work

Same issue. I logged in. I started TFT but game didnt start, just "reconnect" I deactivated my Avast Internet Security (it was the cause in the last weeks), then restarted client. But now i have no Playbutton etc. (like in your picture)

I had this problem before an restarting helped, but now it doesnt.