So, I found this post https://stackoverflow.com/questions/77187827/xcode-project-originally-python-kivy-not-building-to-iphone and it fixed the issues I was having!
Then I had a (new) second issue but this post https://github.com/kivy/kivy-ios/issues/787 fixed it!
Now my newapp is built and working on my device!
ana_locav
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If it helps, here the full error:
Building for 'iOS', but linking in dylib (/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/Frameworks/MessageUI.framework/MessageUI.tbd) built for 'iOS-simulator'