Is the UNITY_64 directive reliable?

I am trying to set up my Unity to build my game as 64-bit for android. I am developing on Windows 10 and using Unity 2019.4.26f1. I am testing my build on my Android phone, which is a Samsung Galaxy S7 which is 64-bit.

• I have set my target architectures to ARMv7 and ARM64.

• I'm using IL2CPP, .NET 4.x

• NDK Version is 19.0.5232133

• Minimum API is 8.0 (Oreo)

• My Android Studio is 4.2.1 and my SDKs are updated

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The issue I am having is that, in game (in both Editor and Target Platform, in this case my Android Phone) the UNITY_64 directive is returning false. This leads me to believe that, I am not building and running the game as 64-bit.

The following solutions I have tried are:

• Stackoverflow QA

• Unity Forum QA

• Creating an empty project, building it, and only checking the directive state

• Uninstalling and reinstalling Unity

• Erasing and resetting project and player settings

• Rebooting computer

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I couldn't figure it out. I decided to check through C# to see what it said (using this as a reference). Turns out if I check the C# System environment if it is running on a 64-bit operating system as a 64-bit process, it returns true. This is obviously in conflict with the UNITY_64 directive; however, I do not know which one to believe.

Is UNITY_64 reliable or is there something going on I am not familiar with? Any help would be appreciated.