Get OTA update without ever activating?

Picked up a Sprint Prepaid Moto E (XT1526) from Best Buy for to use as a media/wifi only device. Device currently has 5.0.2 but it's my understanding the 5.1.1 update is out for the sprint model. However, whenever I check for a system update, I get "Check for update was not available at this time. Try again later". I also tried updating using Motorola Device Manager on my PC and but it said no update and told me my current version was "N/A".

Could this be due to the fact I've never activated service on the device? Otherwise does anyone know how I can get the OTA?