Zyniccee Wherever you play the game, your Apex progress and data is stored on the connected EA Account.
If your Steam and Xbox Accounts are linked to two different EA Accounts, then it is not possible to transfer, (or merge), your Apex progress and data between the accounts.
While it was possible to merge your Apex progress and data between October of 2023 and April of 2024 for platform accounts linked to the same EA Account, now when you link a platform account, it can only access the Apex progress and data that is stored on the same EA Account.