Please read all of this before you do anything since my last suggestion may be the place to start.
This means it "needs" to do this in order to find the OTA (over the air) TV channels which have recently changed. Go through the menu system & possibly Tools to find the auto channel scan and let it do that.
I don't know why it would ask you to do this unless you also have the TV attached to the Internet, then it would know it needs this new channel scan, but I have four TVs in the house and none of them told me they needed a new scan. I knew this because I keep track of what is going on with OTA TV channels.
So, let's assume you've done the scan again, you also say you don't know how to get it back to monitoring your camera.
Once the channel scan is done it may be happy and simply find your camera again. If not, your camera probably came with instructions on how to set it up in the first place, find those and find how how to attach it to the TV again.
If you've lost those instructions look up the make & model of the camera on the Internet to see if you can now download the pdf version of the user's manual and/or setup instructions.
LAST: You may want to try this first: Most remotes have a button called "Input" or "Source" look for that button. With the TV on & pointing it towards the TV press the remote "Source" button, look at all the input sources it has & go through them one at a time and then wait for something or nothing to come up. One of these sources may be your camera.
on Aug 11, 2019