Hello, good day and thanks for your question. Sorry to know about this and I understand that you purchased Minecoins but it did not arrived to your account.
If you are not logged in during the process of your purchase then this should have not gone through and in this case, you can check with Apple with regards to your purchase and an option is to request for a refund and do the purchase again by ensuring that you are logged in to ensure that this will reflect on your account.
Each store that sells Minecraft has its own return policy. Please visit the store where you purchased your Minecraft game for return and refund information.
- Minecraft.net, Microsoft Store, or Xbox – Microsoft Refund Policy
- Nintendo – Nintendo Return & Exchange Policy
- Apple App Store - Request a Refund for Apps
- Google Play - Google Play Refund Policy
- PlayStation – PlayStation Refund Policy
- Steam – Steam Refund Policy
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information.