I've done some research for the past hour but I can't find a definitive answer to what is happening.
So I use a AWUS036NHA, put it in monitor mode, sniff everything, then sniff the AP I want to do the deauth attack on, I don't see any clients, I'm like "OK maybe it's just some type of encryption or protocol I'm not aware of, no worry I will just do a 'global' deauth attack", then I launch the deauth attack with aircrack. I've tried every syntax flavor possible but none of the clients are disconnecting, I've even tried with the mac address of my phone that is connected to the AP.
The deauth attack worked on other networks but I can't figure out why it doesnt work on this one.
Then I noticed that the network I'm attacking is handling 2.4 and 5ghz. So I thought maybe that the problem is that my chipset can't cover both 2.4 and 5 so the network can just get away with the attack? I've also read that the IEEE 802.11w amendment/protocol can make deauth attacks useless but it's mostly used on enterprise networks?
I just want to understand why the attack doenst work and how I can check what is the problem instead of just abandoning. Thank you and sorry for this beginner question.