Mr. Mason said the New York group had not received word of any objection. “He’s coming to work for us in the summertime,” he said.

But the Boy Scouts’ national spokesman, Deron Smith, issued a statement saying the national policy had not changed. As for Mr. Tessier’s hiring in New York, Mr. Smith said, “We are looking into this matter.”

The national organization revised one element of its policy on gays in 2013 when it lifted its longtime ban on inducting openly gay young people as scouts. That change took effect at the beginning of last year. But the group did not address the more divisive question of whether to permit openly gay adults to serve as leaders.

Mr. Tessier, who said last year that scouting “gave me all the good morals that I have,” pushed back.

Image Mr. Tessier in his uniform. Now 18, he will work at a scout camp this summer. Credit... Ted S. Warren/Associated Press

His lawyer, David Boies — one of the lawyers who challenged Proposition 8, the 2008 initiative in California that banned same-sex marriage and was later overturned in the courts — said that the challenge was meant to be nonconfrontational but that a change in the policy was inevitable. “What I hope is they will see this as an opportunity to get themselves out of a place where they don’t want to be,” he said of national scouting leaders. “An institution like the Boy Scouts doesn’t want to be the last bastion of discrimination nationally.”