Can't buy/gift any skin released after Freljord Taliyah

The title sums everything up. Logged in today to check out the new skins but for some reason I can't buy any of the newer skins (when I went to gift someone who has played only 1 game on PBE to check if I can gift them the skins it shows that 'the newest released' skin is Freljord Taliyah. Any idea on what could this be?
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