Updating this thread to share a solution that has worked for some, please try mind pushing a commit to your repository to trigger a build, this should take care of the issue.
I hope this helps!-
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The same exact thing happened to me too today.
I initially thought making a personal/user github page repo would enable my pages public even though repo can be set to private.Looks like it is not so and is only availble for Github Pro
So now I have set back to Public again and "Your page is published at "URL" is missing rom the section in options under settings
Pls correct this Github
This happened to me too. Here's how I fixed it.
1 Go to the 'repository page'
2 Click on 'settings'
3 Scroll down to 'Github Pages'
4 Click on the dropdown for 'Source'
5 Select 'master branch'
Then refresh your website and it should work.