Hello. A connection to the Internet is not explicitly required during any Windows feature update installation/upgrade.
Can you expand on exactly what "it failing step2 installation" means, please? Specifically, Step 2 of what? Also, what exactly is the failure?
Also, what does "using sccm application" mean?
Sorry for the 20 questions, but to properly provide assistance here, we need a lot more details on what you are experiencing and how you are getting there.