I was sent an email?

[chaoko99]

I recently was sent an email with a code in xxxx-xxxx-xxxx-xxxx format, what is it?

[Sizustar]

Item code, use it on the visiophone to redeem it.

[Hosaka]

Likely an item code. Check your Visiphone for the アイテムコード　option and enter the code there to receive your reward in your system storage (Third option from the top in Storage, then second option down next screen).