You get the code via email, by supplying your email at the event. The store doesn't receive physical codes for Command Tower and such. Check the wpn link posted above.
This thread was added on October 27, 2019, with posts from WotC_Lexie.
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I went to my local store on the weekend, but they didn't have any brawl decks left for sale, and I only play online so I don't have any paper cards of my own.... meaning I couldn't participate. What are my options for getting the styles? Will I be able to buy them in the Arena store?
I believe those rewards will only be available through the event.