Resource Download Error [0x000003E8]

I've somehow fixed the issue, dont know how though. Here what I tried:

Reinstalled the app
Opened the game with Turbo VPN
Change the graphics settings to the lowest
Linked every possible account to my ID (EA, Game Center, Apple ID)
Deleted all the additional lineups

After doing these steps, I was able to play the event without any errors.

Hi there, thank you for your report. Could you please let us know which region you are playing from and what device you are using?
In the meantime, please try the basic troubleshooting steps available here: 

Mobile Troubleshooting Guide

Thanks!