I had created 5 VLAN interfaces with IP Address and only 4 showed on DCHP Global including the Internal interface. And only three worked properly. One was my Staff VLAN account and when properly configured staff had issues connecting or if they connected not internet. So i had to delete that interface and use one out of the 4 and now everybody connects.
So i think that something is off or there is a limit. My infrastructure works with UnifI and NPS.
I am now wondering if that was one of the reasons why the Engineer was encouraging me to use Windows DHCP server a couple weeks ago.