but the IP Range for the MGMT VLAN is incorrect.
Yeah 10.0.12/22 or 255.255.252 would be 10.0.12.0 - 10.0.15.255
What are the rules you put on these vlans?
And yes a drawing would be most helpful.. Your saying the devices pull the correct info via dhcp.. If so that would point to connectivity being good, so first thing that comes to mind is wrong rules or lack of rules on the vlan interfaces.