Unable to link Minecraft purchases to my Microsoft account

I am attempting to connect my microsoft account with my Ps4 account. My microsoft account is already connected to a Ps4 minecraft account. How do I find what Minecraft account is using my microsoft account and to disconnect it from it.

Even if you could disconnect it you wont be able to link a different Microsoft account.

Per https://help.minecraft.net/hc/en-us/articles/360037725571-Minecraft-for-PlayStation-4-FAQ

Note: Once a Microsoft account has been linked to a PlayStation® account, neither the Microsoft account nor the PlayStation™ Network account can be associated with a different account. 

If you choose to unlink accounts, then purchases will be returned to the account which made the purchase. Even after unlinking, Microsoft and PlayStation® accounts can only be re-linked to the original account.

Note: As of March 15, 2023, please DO NOT unlink your MSA from your PlayStation account via the in-game menu. You will be unable to link it back if you do so.

This is a restriction imposed by Sony.

When I purchased Minecraft, it prompt me to create a Microsoft account to link it with, which is the one I am using now. I am 100% sure this email is linked when I purchased Minecraft but it does not appear under my Microsoft account order history.

Do you know if it's possible to unlink my PSN and Microsoft account? Minecraft's website says you can only link it once which is really bad news because now I am left unable to play Minecraft online. This could all be solved if I could just make a new Microsoft account and link it to my PSN

I think you misunderstood, my Microsoft account still owns my Minecraft account, however, my Xbox account is also linked to my Microsoft account. Whenever I try to login and access my Minecraft account, it automatically signs me into my Xbox, which does not have the Minecraft account. It's still linked to the email, but my Xbox account is stopping me from getting into the account.

The Microsoft account and Xbox account are one and the same...signing into an Xbox account would be the same as signing into a Microsoft account.....if I go into my Microsoft account history on my PC, it shows my Xbox purchases.

That sounds like you have a second Xbox and/or Microsoft account which is linked to the Minecraft account

I have linked my Microsoft account to my PS4 account in order to play cross platform minecraft. The issue is that I would like to play cross platform with my brother, who is playing using my Xbox One. My microsoft account is now associated with
both my PS4 account and Xbox Live account, which means that we share a gamertag. For this reason I cannot add my Xbox account as a friend on Minecraft and cannot play cross platform. I attempted to resolve this issue by unlinking my Microsoft account from
my PS4 account but this did not resolve the issue. I was unable to link a different Microsoft account to my PS4 account, a message informed me that my account was already linked to another and could not be linked again.

Please can you make it free Minecraft Minecraft store PS4