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The Galaxy Skin is one per account but you can have up-to I think 5 on one device. I would check with Epic Games to see the maximum for one device.
I have two Note 9 and two Fortnite accounts. So you're saying I need two samsung accounts, one for each phone? I can't use the same samsung account on both phones to get that sweet skin?
At this time, only the Note 9 and Tab S4 devices can get the skin.