Carrier iPad Air 2 on T-Mobile: "Couldn't activate cellular data on network"

[sterl1002]

So I received my air 2 wifi + cellular on Friday, but waited until today to activate cellular. Decided to go with T-Mobile because of their $10, 5GB for 5 months promo. Entered all my info and it said activating cellular. Then I recieved a popup saying "couldn't activate cellular data on network", however I recievend a email from T-Mobile saying everything went through and the plan is active. The iPad just says "Searching..." And has for about a hour. I tried resetting network settings and that did nothing. The cellular tab resembles that of a active cellular iPad (no set up cellular option, just enable/disable LTE, etc. Any thoughts? I'm using the Apple SIM. Thanks!