If you are trying to get to Concorde metro in Paris, you can't get there via the line 8 through June 30, as you normally can. LIne 8 trains will still pass through the station, but they will not stop and you can't get off or on.
Thus, you can't, for example, transfer from the Line 1 at Concorde to the Line 8 to go to Ecole Militaire, etc. etc.
Closest line 8 stop to there is Madeleine, or Invalides on the other side of the river and down a bit.