I have Xbox Live accounts for my children as it's pretty much mandatory now for playing Minecraft on Kindle (or anything except on Java edition I think). The children use child accounts on their Fire 8 HDs.

Their in app purchases (all approved and paid for by me from my parent account which is an Amazon account). Their Xbox Live accounts are part of a Microsoft Family account where I'm also the parent account (so complicated!).

Today I am getting this issue: I buy Minecoins and/or add-ons for the child accounts on Minecraft Marketplace, my Amazon coins are debited, but no Minecoins are credited and all Marketplace purchases fail to complete. There is no advertised way to buy Minecoins with Amazon coins but when I attempt to buy Minecoins on their Kindles under their child accounts I am prompted to sign in as the parent account and pay for them in Amazon Coins. It is the only option, to pay in Amazon coins.

The problem is that the Amazon coins are deducted but the Minecoins are not credited. They're not credited to the child account or to my parent account. This is the same whether I buy Minecoins directly (+ button next to the Minecoin counter) or buy them indirectly by buying an add on. The add on doesn't appear on my parent Minecraft account either, just like the Minecoins don't appear there either.

From the Amazon App store phone app I can confirm the Amazon coins were definitely deducted but it doesn't show me the transaction history. Probably I need the desktop website to see transactions.)

If I open any new Minecoin transaction in Minecraft Marketplace it tells me there's an in progress purchase that hasn't completed and prompts me to compete it now. Or (perhaps crucially) it prompts the child to complete it - it doesn't ask for the parent account credentials. This repeatedly fails, saying "unable to connect to the app store". Unclear if these means the Minecraft Marketplace, the Amazon App Store, or maybe even Xbox Live.

Might be a "Block Friday" or Black Friday issue?

In attempting to reproduce this, it's critical to use an Amazon Fire for Kids child & parent account. It may also be critical to use a Microsoft Family child and parent account for the XBox Live integration, in case that's the problem. I have seen similar cases closed as Cannot Reproduce which may not have reproduced the critical conditions.

Needless to say this is very annoying because effectively Mojang has taken $25 off me today and I have nothing to show for it. More to the point my children are very upset because they were promised these add ons to play with. It's actually the third time we've tried to buy them this addon, the third time we've lost our money. Really not acceptable in e-commerce, particularly when children are the main market.