Scribble It! Premium DLC Giveaway Key not long enough

Microsoft Keys are 25-characters long and only 15 are displayed., Steam!!!!!

The instructions to redeem it says to do so in the Microsoft Store app. 

XXXXX-XXXXX-XXXXX-(missing the remaining 10 characters)

Or, maybe it's the first 10 characters of the code that are not displayed.

Edit: I'll try what is given in Steam.  The redemption instructions may be wrong! :)

Edit 2: It was a Steam code.  Wrong redemption instructions. ;)