The Red Devils advanced with a comfortable 4-0 aggregate win, having crushed Yanga 3-0 at Cairo Stadium a fortnight ago.
Ahli, who aim to win a seventh Champions League title, will face Kano Pillars in the round of 16.
The Nigerian club advanced after overcoming Senegal's Douanes on the away goal rule following a 1-1 aggregate draw.
Ahli needed just five minutes to ensure their progress to the next round via a goal from Angolan striker Flavio.
A Young Africans defender dithered to clear the ball from his own box to allow Abou-Treika to steal possession and feed Flavio, who caught out the advancing keeper with a low right-footed shot.
Classy playmaker Abou-Treika thought he had doubled Ahli's lead midway through the first half when he converted Gilberto's cross from close range but his effort was ruled out for offside.
Young Africans tried their luck from distance more than once but their tame shots did not annoy Ahli keeper Ramzi Saleh.
Neither side was able to create any goalscoring opportunities in a dull second half as Ahli easily booked a last-16 berth.