I've tried this on various versions of Unity 2019.x and Xcode 11.6
Develop Unity project
Build project for iOS
Open Xcode for the project
Archive Xcode project
Validate archive -> Fails with "Invalid Bundle. The bundle at '[app]/Frameworks/UnityFramework.framework' contains disallowed file 'Frameworks'
There are solutions posted online about allowing/disallowing embedded Swift code. TO BE CLEAR, THIS PROJECT DOES NOT USE SWIFT CODE.
Where can I start with researching this issue?