Hello @Lennart van Tuijl ,
Welcome to the MS Q&A forum.
I'd love to help you resolve this issue. After reviewing your problem, I did some research and found corresponding detailed articles with the troubleshooting steps. Kindly review and try these steps:
1) Change the email address or phone number for your Microsoft account.
2) Which account do you want to use?
3) Manage accounts on your PC.
4) Simply try different browser or new incognito window.
Let me know if you need additional assistance. If the answer was helpful, please accept it and complete the quality survey so that others can find a solution.