I was trying to get my flashlight back on the homepage.
I went to settings and then Control Centre and reset my Home Screen to default settings and voila my flashlight came back on.
iPhone 6s, iOS 15
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For others who visit this post wondering how to add flashlight to Control Centre:
See Turn the iPhone flashlight on or off – Apple Support (UK)
Eg: says:
"Use Control Center to turn the flashlight on or off
- Open Control Center.
- Tap
to turn the flashlight on; tap it again to turn it off. - Note: If you don’t see in Control Center, you can add it. See Customize controls."