My microsoft account is linked to my Playstation network but I don't remember my old...

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

So recently, I updated my PS4 to the new Bedrock Minecraft, and I tried logging in for the first time, and I guess its linked with another PS4 account. Although I don't remember linking my Microsoft account with the Playstation network.

Could someone help me unlink this PS4 account from my Microsoft account so I can sign in?

(I'm new to the questions thing, so I didn't know what category and such to post this under, so don't judge lol)

So recently, I updated my PS4 to the new Bedrock Minecraft, and I tried logging in for the first time, and I guess its linked with another PS4 account. Although I don't remember linking my Microsoft account with the Playstation network.

Could someone help me unlink this PS4 account from my Microsoft account so I can sign in?

(I'm new to the questions thing, so I didn't know what category and such to post this under, so don't judge lol)

bought sea of thieves and accidentally linked my deleted Microsoft account to my PlayStation one. I know longer can play the game anymore because I can’t connect it to my new Microsoft account. I was wondering if yall could delete my old Microsoft account from my PlayStation account.

Microsoft cant do that since the linking is starts from Sony's end.

per https://support.seaofthieves.com/articles/18270908747282-PlayStation-Microsoft-Account-Linking

• Be warned, account linking is a permanent decision, as players are only able to link a single Microsoft account to a single PlayStation™Network account. Only use the Microsoft account on which you intend to carry over your progress to launch!
  

So basically you can never link a different Microsoft account to your Playstation account. It will be forever tied to the deleted Microsoft account.

Keep in mind this is a restriction imposed by Sony. Not Microsoft.

When I logged out of my account on minecraft on my ps5 I forgot to unlink it. The email that I used on it is an old email which I don't use anymore. I can't remember what the email was. Since my old account is still linked, When I try to create a new account on it it doesn't work. What should I do?

You wont be able to link a different microsoft account. Youd have to continue using the old one.

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