We have fixed the Windows 10 code error. You can log in to our Mojang account and redeem your Windows 10 code if you purchased Java Edition BEFORE October 18, 2018.
If you're eligible, you have until midnight PST on Monday, April 20 to redeem your code.
minecraft.net/en-us/article/…
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Great question! Unfortunately, Mac currently only supports Minecraft Java edition, which is not crossplay compatible. ^SP
May 2, 2020 · 6:15 PM UTC