Ok I'm back lol. Just needed to google some stuff.
Ngaiz not sure I can help much.
My dh has non obstructive azoo. Diagnosed nearly two years ago. We did nearly four months of pregnyl with our first FS, to see if it woukdhelp with his zero on SA. It didn't
Theory is hcg helps to synthesize testosterone and testosterone is needed for sertoli cells to develop into mature sperms. FS thought my dh might have this kind of spermatogenesis issue. We gave it the nearly four months, but got annoyed with waiting and no progress so has tese and got lots of sperm. It's crappy but it fertilises. Five cycles down though only on preg, but m/c twins. Now know I have issuestoo.
Youyr dh produces yes? So you might have more luck.
We don't have a reason for the azoo. Y deletion fine, testicles fine (not small), no cf , fsh and other hormones fine. Testosterone slightly low. New FS says the ptegnyl would never gave worked for us.
You need to do it for four to sux months for it to see results, if it does.
Dh was horrible on it. Grumpy and moody and horrible to inject, but we had to give it s go before mutilating testicles.
You could ask about pesa for your boy.
Soz I'm not much help. Good luck hun xx