This one?
https://www.endocrine.org/news-and-a...4-press-blithe
If so ... in the preliminary testing, they are deeming it "effective" if they detect "less than 1 million sperm cells in 1 milliliter of semen". I'm no endocrinologist, but to me that still seems like ... a lot. And it takes 15 weeks of daily use to get to that level.
Still ... it is known that regular use of exogenous testosterone can cause infertility, so maybe.
If that's the one you're thinking of, a previous article I found about it said they were hoping to go into clinical trials in 2023, and hopefully come to market by the end of 2024. So, assuming it gets approved (which isn't a given, in our current political climate), it may not be light years away.