404 on profile URL

[WebDevSchumacher]

Hello,

I'm having troubles setting up my public profile.
When opening https://github.com/WebDevSchumacher in a different browser or private window, it shows Githubs 404 page.

In my profile settings, "Make profile private and hide activity" is not checked. As there is no explicit "make profile public", I'm assuming that's the default.
I also created the profile repository with the Readme.md, which is also not showing up when viewing my profile while logged in.
I also have an actual code repository with content, which is set to public and pinned in the profile.

What am I missing here?
Any assistance is appreciated, thanks.