In case you missed the announcement, the System Center Configuration Manager Blog (currently hosted on Tech Net), is moving over to the Tech Community platform.
So get a new RSS feed set up to the new blog as the old one will no longer be maintained:
https://techcommunity.microsoft.com/t5/Configuration-Manager-Blog/bg-p/ConfigurationManagerBlog
You can also set up a new account on Tech Community and follow this (and other blogs).
Anyway, here’s a link to the announcement:
https://blogs.technet.microsoft.com/configurationmgr/2018/10/19/this-blog-is-now-retired/