Hi CdD89,
Thanks for posting! I understand you're having some issues with the zoom functions on your iPhone 11 Pro. The wide angle lens is a great feature, and I'll be glad to see how I can assist. It sounds like you've tried some great troubleshooting already.
By any chance, do you have a case on your iPhone? If so, does it help if you remove it?
Also of note, the zoom function is a little different on the iPhone 11 and iPhone 11 Pro. Check out the information below to see if it might apply: iPhone 11 and iPhone 11 Pro camera features
"The redesigned Camera interface in iPhone 11 and iPhone 11 Pro shows you what's happening outside of the shot that you're framing. This can help you decide if you need to re-frame your shot or switch to a different camera on your iPhone for a better photo.
When you're using the Wide (1x) camera, the viewfinder also shows what the Ultra Wide (0.5x) camera sees. Tap the .5 button to switch to the Ultra Wide camera. If you have iPhone 11 Pro, you can also see the Wide (1x) view outside of the frame when you're using the Telephoto (2x) camera."
If that doesn't apply, and you're able to determine that an iPhone case isn't a factor, I recommend that you Contact Apple Support next.
Take care.