Why do I never get any shares when I try to buy into an IPO through my broker?

I’ve tried a few times now to get into IPOs through my broker and I never seem to get even a small allocation. It feels like unless you have a really big account or some kind of special relationship with the broker, you’re just not getting in.

Am I doing something wrong? Is there a minimum account size or certain brokers that actually give regular people better access? Or is this just how IPOs work these days?

Just trying to figure it out.