Can you only sign into Minecraft with only one Microsoft Account?

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.

According to Mojang:

"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 means that you may need to use your previous Microsoft account and for your reference, you can check this link: https://minecrafthelp.zendesk.com/hc/en-us/arti...

Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.

Option 1 Use your Microsoft account to sign in using only one account. You do not have to use a separate account to
link it I think.

. option 2. You can buy minecraft realms to be able to use one account. $

I don't understand. You can sign in to the Minecraft website with your Mojang or Microsoft account?

And the error happens only on the launcher then?

That is correct, Emil.

Microsoft owns Minecraft. Therefore, a Microsoft account is required to play the game.

If you want to play with friends on different platforms or join Realms on Minecraft for PlayStation, you will need to link a Microsoft account to your PlayStation Network (PSN) account. Here is how to do that.

How to connect your Microsoft account to PlayStation in Minecraft: Bedrock Edition

Launch Minecraft on your PlayStation.

Select Sign in with a Microsoft account on the title screen.

Visit the code redemption site on a browser.

Input the code that your game is displaying.

Sign in to the Microsoft account you want associated with your PlayStation account.

Note: only one Microsoft account can be associated with any PlayStation account at any one time. If the account you are trying to sign into has already been linked, you will need to use a different one.

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?