The 
Hateforged Blazecycle has mysteriously sold out on the Mountain Dew redemption site, leaving players who stocked up on cans unable to claim their reward.
Update: it seems that the promotion did have a note that the supply of rewards items is limited. Thanks to Thid for spotting it! It’s still possible, and even likely that Blizzard will add in some more codes before the promotion is done. After all, it does run until the end of January.
A Digital Item with Limited Supply?
It’s rare for digital items to sell out, but that seems to be the case here. The promotion, which is set to run until January, appears to have hit a halt, with Mountain Dew seemingly running out of redemption codes. This has left many frustrated and wondering if Blizzard will step in to provide more codes soon.
A Temporary Issue?
Players on Reddit are speculating the issue might be temporary, with more codes likely on the way. Given the popularity of the mount, many hope that this is just a logistical hiccup.
