In High School, the minute a try is kicked, it is dead, regardless if the kick succeeds, misses, or is blocked behind the line. If there is a fumble on a two point conversion and the defense takes possession, the ball is dead and the try has failed.
In the NCAA/NFL, if a PAT is blocked behind the line and possessed, or a two point conversion is turned over (interception or fumbled) and returned into the end zone it adds two points to the defense's score.
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None. During an extra point attempt only the team attempting it can score any points. If the defensive team blocks the kick it becomes a dead ball.
The above is true EXCEPT in College Football. In college, the defense can return a blocked extra point or a turnover during a 2-point attempt. If the defense can return it across the opposing goal in one play, they are awarded two points. If they fail, the try is over and the ball is kicked off as usual.
If you kick the ball after a touchdown, it is one point. If the ball is passed in or ran in, then it is a two point conversion.