The Republic of Ireland fell to a surprise defeat in the first game of the Nations League.
The only goal was scored by Eduard Spertsyan, who beat the Republic keeper with a rasping drive from distance.
Chiedozie had a chance to score in the first half, but he couldn't get a head on the ball.
The Republic has yet to win in the Nations League.
With three difficult games against Ukraine and Scotland coming over the next 10 days, it is now 11 games without a win in the competition.
After a difficult start to Stephen Kenny's reign, an eight-game run of draws at home to Portugal and Belgium had lifted the mood.
Kenny's side were stunned by a team ranked 92nd in the world in a game that stirred memories of last year's embarrassing World Cup qualification loss to Luxembourg.
Kenny's side found the going tough against a defensive unit led by captain Varazdat Haroyan, despite the fact that the Irish were expected to overwhelm an Armenia team that lost 9-0 to Norway in their last outing in March.
The lively Tigran Barseghyan's goal was ruled out after he was ruled to have been in an area where he shouldn't have been.
The Republic did not heed the warning and were punished when Barseghyan's shot went in off the right-hand post.
The Republic only had themselves to blame after they failed to open the scoring.
Robinson hit the side-netting on 12 minutes after being found by the Rotherham attacker, and then had a chance to put the game to bed after being found by the same player on both occasions.
He missed the Republic's biggest chance of the opening half when he failed to keep his free head down.
Barseghyan's disallowed goal and effort from distance were enough to give Armenia enough threat despite the fact that they no longer have the playmaking talents of Mkhitaryan.
The Republic had to wait until the 62nd minute to register their first chance of the game, when Jeff Hendrick curled a tame effort into the home keeper's grasp.
While the Irish tried to break down the home side's defence, Spertsyan picked up the ball and unleashed an unstoppable 25-yard drive to the delight of the home fans.
The Republic's miserable Nations League record continued ahead of a triple-header against more accomplished opposition in Ukraine and Scotland.
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