We dont buy Platinum directly on Xbox, Read below for how to get your Platinum on your Xbox!
Be sure Crossplatform is enabled for PC Login for this process.
warframe.com/cross-save
After you did Cross-platform is Enabled - ON (PC and Xbox), We will give you the steps
Once you receive the platinum on PC, you can use the Platinum on your Xbox acc.
If you dont have PC to claim the Platinum
Enable Crossplatform, and send us your Warframe PC Login, I will do it for you!