I am unable to link my Microsoft account to my PlayStation.

Can I have the exact message prompt? It may be stating that the Microsoft account is already linked to a different Playstation network.

Hi, I hope you're doing great out there. I am an Independent advisor and I am here to help you in regard to your concern.

May I ask what is the exact error or issue that you're experiencing whenever you're trying to link your Microsoft account to your Playstation network account on Minecraft?

Hi, it keeps saying that my account is already linked which is not possible due to me just making my PlayStation 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.

This is what they had to say:

Hi there,

Sorry to hear that you are having trouble with the link between your PlayStation Network and Microsoft account. Once a Microsoft account has been linked to a PlayStation Network account, neither the Microsoft account nor the PlayStation Network account can be associated with a different account.

Please be aware that If you choose to unlink accounts, then purchases will be returned to the account which made the purchase. Even after unlinking, Microsoft and PlayStation Network accounts can only be re-linked to the originally linked account. For further information, please visit our Minecraft for PlayStation FAQ:
https://help.minecraft.net/hc/en-us/articles/4409145073165-PlayStation-Technical-Support-FAQ

If you are unable to find or login to the correct Microsoft account, please contact Microsoft Support here for further assistance, as we do not have access to their account management systems:
https://support.xbox.com/en-US/contact-us

For additional help with PlayStation games, purchases, accounts, or hardware, visit AskPlayStation on Twitter or contact PlayStation support:
https://www.playstation.com/en-us/support/



Long story short, there is no way I am able to play multiplayer on my Playstation until they update their trash policy to make it so that I can link MY account.