How can I find which microsoft account is associated with my PlayStation account?...

I'm Samy an independent advisor. Welcome to the Xbox community. How are you?

Linking a Microsoft account to a PlayStation 4TM account

WARNING: Once a Microsoft account has been linked to a PlayStation 4:tm: account, neither the Microsoft account nor the PlayStation:tm: 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 4:tm: accounts can only be re-linked to the original account.

Hi Guyzuntz.

My name is Mauro and am glad to assist you. We are sorry to hear that.

Please contact PS support or Microsoft account support you are currently in the XBOX forums.

Thanks,
Mauro

I'm Samy an independent advisor and I'll be helping you

How are you?

According to Mojang, it is not possible to link another account to your PlayStation account. For more in-depth help on this, I recommend contacting them.

''Linking a Microsoft account to a Playstation 4:registered: account

WARNING Once a Microsoft account has been linked to a PlayStation 4:registered: account, neither the Microsoft account nor the PlayStation:tm: 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 4:registered: accounts can only be re-linked to the original account.

If you believe that your Microsoft account or PlayStation:tm: Network account have been linked incorrectly, then please contact Minecraft support.

https://help.minecraft.net/hc/en-us/requests/new

I have a Microsoft account, how do I sign in on my PS4:tm:? 

WARNING Be certain you use the account details for the Microsoft account you want to be associated with your PlayStation:tm: Network account.

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

You will not be able to link another Microsoft account to your PS4:tm: account.'' 

https://help.minecraft.net/hc/en-us/articles/36...

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.

I need to unlink my PlayStation Network account from my old Microsoft account which I don’t remember, & link it to a new Microsoft account to play Minecraft

You can unlink the psn account however you CANT link a different one.

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.

This is coming right from the Minecraft website

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