1️⃣Be sure Crossplatform is enabled and you must have a Computer - PC for this process. 

Link: warframe.com/cross-save

2️⃣Set up crossave PC - XBOX for your account , DON'T FORGET SET UP PRIMARY ACCOUNT XBOX , or you will lose your platina

3️⃣Send Warframe (PC) account  EMAIL + PASS or EPIC GAMES (if you have alredy linked with warframe account) 

4️⃣I will send  extra info via order chat

❗️ Buying platinum via 3rd may get your account suspended for 14 days.