@illugakun89
Since @EA_David has already verified that the current account you are posting on is not linked to an Xbox Account, you will have to log in with the account that is linked to your XBL Gamertag. If you do not know the account, you can contact an EA Game Adviser @ https://help.ea.com/en/contact-us/new
Once you find the account and log in on your companion app, you will still see a PC soldier. Don't worry, this is normal, it always displays a PC soldier by default. To switch to your XBL soldier, follow the steps below:
While in the Companion App:
1. Click the COG wheel in the top-right corner
2. Click Settings
3. Click Change Profile
4. Select your XBL Account
5. Click Confirm
Now when you go to your Career section, you will see your XBL soldier