Until the devs fix the launcher here is a quick and easy trick to use.
Swap your gameplay proxy in the launcher to EU, it works for me.
As well download the game through Steam and try this trick, if you are not able to do it through Arc or the pre-arc game.
Ive been able to use a variety of these combinations to be able to log in for the past week since this started.
Hopefully it will be fixed soon, until then this should work.
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