If you go to the Google Store’s Nexus 9 page, you’ll see that it clearly shows Verizon compatibility for the tablet’s LTE variant. The problem is that this claim simply isn’t true. Last December, a thread was started on XDA regarding the issue, in which a few people showed that putting a Verizon SIM into the tablet made it exhibit some rather odd behavior.
[Update: Fixed In Android 6.0.1] Google Says The Nexus 9 LTE Works On Verizon—A Year Later, It Still Doesn’t was written by the awesome team at Android Police.
Source: Andriod Police