Greetings,
It is always best to configure the WAP device directly connected to a computer first, make sure on the WAP you change your ip settings and set a static ip in the same subnet you are running and set the correct mask, gateway and dns pointing to whatever router you are using.
After making sure all of that is properly configured connect it to your switch and see if you have access to the GUI of the wap from a computer connected to your switch, do some ping tests as well.
If you still cannot talk to the unit after doing the initial configuration and properly assigning it the static ip within your subnet and pointing it to your gateway then you should propably focus on your switch and contact enterprise support for further assistance.
Their number is 1-800-553-2447
Thanks.