How do i unlink a Fortnite account from ym microsoft account?

Hello, first it's a pleasure to be able to help you today.

My name is welcome to the community.

Hello Dylan, click on the link below and log in with your Microsoft account and see if you have Epic Games linked to your account, if you have more than one Microsoft account you will have to repeat the process and login.

Microsoft Consent

https://microsoft.com/consent

At the moment, there is no way to transfer game progress/purchases from one Microsoft account/gamertag to another so you are limited in what you can do on MS side.

If your son is only playing Fortnite and that's the only game involved though, you may check on Epic side if and how is possible to unlink and relink the epic account so that everything strictly related to the Epic account may be managed
in the process.

This may help:

https://www.fortnite-2fa.com/how-to-unlink-xbox-account-from-fortnite-without-verification/

Easiest is unlinking your wrong Skype account from your Microsoft account from your computer's browser. Follow the instructions here:

support.skype.com/.../how-do-i-unlink-my-skype-and-microsoft-or-facebook-accounts

After unlinking you can start the linking process again and pick the right Skype account this time around:

support.skype.com/.../how-do-i-merge-my-skype-and-microsoft-accounts

this may help

https://epicgames.helpshift.com/a/fortnite/?s=epic-accounts&f=how-do-i-change-the-email-on-my-epic-games-account&l=en

http://www.davevoyles.com/2018/05/20/unlink-xbox-live-account-fortnite/

Hi mate, do you know how to unlink the microsoft account from the playstation account? I accept that unlinking will cause loss etc.

I had a look and didn't see anything under devices or subscriptions.