Hi FelixKok, I am Mohd Zubair, a user like you. I am here to help you.
Log out of the launcher and Minecraft.net, re-login to the main site and attempt to make a profile. Sometimes, a disconnect between the launcher and the main site causes authentication issues. Close the Xbox app installed by Microsoft Store, reopen it and attempt to run the launcher once again.
Please try this and let me know if it works.
Feel free to rejoin this conversation.
Best regards,
Mohd Zubair