Minecraft Microsoft unlink account fail

Unfortunately, once you link a Microsoft account to a Minecraft account, I am afraid they cannot be unlinked!

Find more about this here: Unlinking a Minecraft: Java Edition Account and a Microsoft Account – Home

Regarding your situation, it will be best if you can get in touch with PS support for assistance, since you have to unlink the Microsoft account from your PS account.

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.

your Minecraft account is your Microsoft account

once linked, accounts cannot be unlinked

You may need to ask them how to unlink your Minecraft account to your Nintendo account.

That will be on Mojang's end, Microsoft does not have the capability to unlink an in-game account.