Just adding onto this post.
Coins are all linked to the platform you bought it on.
Not sure if you can use the currency from the EA App on Steam but you need to at least launch it once from one platform IIRC.
I also don't recommend buying coins from third party sites as the way they've got these codes can sometimes have a bad history linked to it.
That said history could result in account action if something is found about it. (Next to that, a lot of these sites might just rip you off, so it's better to stay away from them overall)
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