When I try to unlink my Microsoft account from my minecraft PlayStation 4 by going into...

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

That's really weird, since when you unlink a Minecraft/Microsoft account from a Playstation ID it can only be linked to the same Playstation ID.

Are you completely sure you are signed in with the correct Playstation ID and trying to login with the correct Minecraft/Microsoft Account?

I don’t know what email I used to link to my PS5 for Minecraft account. Could somebody unlink the account connected to my minecraft account if not can you tell me what email is linked to my minecraft account. Would I have to go to PlayStation to get it unlinked or do I go to Microsoft since it’s the accounts that are needed.

Even if you could unlink the account you wouldnt be able to link a different 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.

This is a Sony imposed restriction, not Microsoft/Xbox.

Hello ,

Thank you for posting on the Xbox forums. We understand that you are unable to unlink your Microsoft account from your PlayStation account. There is

a support article on Minecraft's support website which explains more about linking and unlinking the accounts. There is a risk involved with unlinking the accounts. The article talks more about the risks of unlinking the accounts. If you would like to continue
to learn how to unlink the account, we suggest reaching out to
Mojang support and PlayStation support. Be sure to let us know the results!

I think I'll go with the option of creating a new Microsoft account for now, and so then whenever the unlink ability on minecraft is working I'll fix my brothers account. But I thank you for your great service.

Kind regards,

Fellow Gamer

The Minecraft for PlayStation login code error when trying to join Realms or play with friends can be fixed by unlinking and relinking your Microsoft account to the game. If that doesn't work, try creating a new PS account and linking your Microsoft account to it, suggests a Reddit user.

Steps to unlink and relink your Microsoft account:

1. Unlink your account:

Launch Minecraft.

Go to Settings > Profile.

Select Unlink Microsoft Account.

2. Relink your account:

Launch Minecraft again.

Select the option to add an account.

Enter your Microsoft account email address and password.