Stand Alone WIFI System

[dr.know]

You are streaming xfinity TV from the cloud/internet via cable internet.
You want the camera on an isolated network not connected to the internet.

You need an internet connection to boot the cam up so it will authenticate,
Here is link to more detail on this answer from @sodcam

Using Wyze Cam 2 w/o Internet. Will it work?

Yes, recordings are stored as 1 minute unencrypted mp4 files in folders sorted by the hour. You can easily work with them on almost any modern PC or smart device. You need an internet connection to boot the cam up so it will authenticate, but not after. If you have cell coverage at the location, briefly use your smartphone as a hotspot to get the cam up and running. Test it by viewing the cam with the Wyze phone app. Then can turn off the phone hotspot and the cam will record to the SD card -…

edit: or the more detailed explanation @tomp gave. . .