I looked and couldn’t find this bug already reported. Apparently, this 4+ year old phone is still supported, as per the app details in the app store and elsewhere. I miss using this app. :(
Platform
iOS 17.4.1 on an iPhone XR
App version number
2.15.7
Screenshots of what you are seeing
Description of problem
Step 1: open app
Step 2: tap the camera icon
Step 3: choose the camera, if it’s not already selected.
Message on screen: Sorry, the device you are using is not supported
device/ invalid-device
If I chose PHOTO, the app will attempt to ID from a photo already on my camera, but usually fails, as I often get an idea while using the camera in the app and getting the plant from different angles & distances.