How to redeem Microsoft Code?

2 days ago I bought an x box controller which contains a fortnite bundle. This bundle can only be redeemed with an xbox / Microsoft code. My problem now is that I do not know how to acccess the former playstation. (now a pc acc.) To connect with a non existing xbox Fortnite account so that I can redeem the code at xbox / Microsoft so that I then get it on the pc.

You simply create an Xbox account and link it to your Epic account. Then log in with this Xbox account at microsoft.com/redeem and enter the 25-digit code…