RenderTexture.Create failed: format unsupported

This error shows up when I make a Mac OSX build of a game I am making that utilizes the Render texture feature. It works for a Windows build, but it confuses me on why it is not supported for a Mac build. Here are the settings I used for the Render Texture and Camera:

For the Render Texture

• Size: 4096 x 4096

• Anti-Aliasing: None

• Color Format: ARGB Int

• Depth Buffer: 16Bit

• Wrap Mode: Clamp

• Filter Mode: Point

• Aniso Level: 0

For the camera

• Clear Flags: Solid Color

• Background: Default Color

• Culling Mask: Default Settings

• Projection: Orthigraphic

• Size: 16.8

• Clipping Planes: Near: 0.3 Far: 1.6

• Depth: 0

• Rendering Path: Use Player Settings

• Target Texture: (The render texture I am using above)

• Occlusion Culling: true

• HDR: false

Are any of these settings causing this error or am I forgetting something. Currently when this error occurs, I just see a blank white panel where the render texture should be. And the only use for this texture is to show the player what is happening and allows for input handled through a script.