Tried to download a few times but keep getting the same problem. Not sure what I am doing wrong?
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I had the same problem, you just have to log in with your microsoft account, and thats it

This is a billing issue, and the bug tracker cannot do anything about it
I have tried to log on wit my Microsoft account, unfortunately the issue still remains. Even though I have received the receipt in my email the game does not populate in my account.
This sounds like a launcher bug, not a minecraft Java edition bug.
Read the moderator note in MCL-16570
I have exactly the same problem. Still can't resolve the issue.