Have you confirmed that there is a Nougat update even available for this device? One of the sites I look such things up on (GSMArena.com for those that care) is indicating that Nougat has not been released by Huawei for that device. On the
page on that site for this device, it only indicates Marshmallow, there is no indication of an update to Nougat as you see on the page for, say, the
Nexus 6P.
Not all devices get the update when Google announces availability, that availability is only for devices for which Google controls the update process. The rest come from the device manufacturers or even the carriers.