Hey @Tylerwhisper,
Progress is stored on the EA account level, not on individual platforms like PlayStation, Xbox, Steam, etc. This means if you link your platform to a different EA account, you'll lose access to that progress.
Your items cannot be transferred or merged from one EA account to another, so if you linked an account and lost access to the progress, that would be because your platform is no longer linked to the original EA account where that progress was initially made.
The only way to attempt restoring access to that progress would be to re-link your Xbox to its original EA account, ...
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