How do I play Minecraft from a redeemed Mojang account?

That worked perfectly, thank you!

Another question: I have a second Minecraft account that has not yet been transferred to Mojang to Microsoft.

Can I transfer it to this account and still have me and a family member use it or does the account have to be transferred to another Microsoft account (which I don't yet have)?

Thanks.

I'm not 100% sure about this, but to be on the safe side, I would have that family member create a Microsoft account and help them with the redemption process if you need, just to make sure that everything runs smoothly for them.

If you log into the
Microsoft Account page with the account that redeemed the code, then click on Payments & Billing > Order History, it should show the redemption in your list. You should be able to click right on the title and it will take you to the Microsoft Store page.
You can initiate download from there. Either it'll open the Windows 10 Store, or ask you which devices you'd like to remotely install the device to in the event it's Xbox One.

Please let me know if you have problems or questions during that process and I'll be happy to help!

I'm not 100% sure about this, but to be on the safe side, I would have that family member create a Microsoft account and help them with the redemption process if you need, just to make sure that everything runs smoothly for them.

That's a good idea, just in case. If anyone else knows for sure I'd appreciate knowing either way.

Thanks.

When you redeemed your Java Minecraft on Mojang, you have gotten a 5x5 code to redeem Minecraft on the Windows 10 store.

This redemption is a separate service of your Mojang account, and it's possible to use a Microsoft Account email that is different from your Mojang account email.

Mojang (which gives you Java Minecraft) is separate from the Microsoft Windows Store App, which uses a Microsoft Account email when you redeemed that 5x5 code.

After redemption of that code, the Windows 10 Minecraft is tied to the Microsoft Account email you used on your Windows 10 PC. From then on, you don't really need the Mojang account anymore, if you only want to play on Windows 10. You will then get the game
from the Windows 10 store only, with the E-Mail account you used on the Windows 10 store during code redemption.

So make sure you are signed in with the Microsoft Account email (which might not necessarily be the Mojang account email) when you use the Windows 10 Store app to re-download your Windows 10 Minecraft again.