My African female was 3 mos old when she started laying...very broody. None of her 15 eggs were fertile. Question is if my gander is fertile!
Must have been a Chinese!!!!
And that doesn't mean your male is infertile, that's very young for a goose, she may not have actually been able to accept the male correctly. Maybe they were not actually mating.

We have three geese we got in April 2018 and one just started laying October! That’s not 2 years lol