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Unfortunately, it's likely due to the operating system or hardware you're using – since they don't meet the system requirements for Lens Studio.
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Minimum Requirements
Operating System: Windows 10 (64 bit); MacOS 10.11+
Hardware: Minimum of Intel Core i3 2.5Ghz or AMD Phenom II 2.6Ghz with 4 GB RAM; Intel HD Graphics 4000 / Nvidia GeForce 710 / AMD Radeon HD 6450 or better; screen resolution of 1280x768 or higher
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Happy creating!

Hey Moe,
This is definitely possible, but it's also pretty difficult to set up.
You can have two device tracking components running at the same time - a world tracking one for back camera, and rotation tracking one for front camera. On camera switch, move your camera to the appropriate tracker. You can do this by having the camera on its own SceneObject and reparenting it under the correct tracker object. You'll also need to make sure the rotation only tracker gets moved to the same position at the other one when the camera switches to it.
Next you'll have to reposition everything in your scene to be mirrored around the camera whenever the camera switches. This part will be pretty hard. You can do it in a hacky way by using an empty SceneObject as a pivot to make the math a little easier. Move it to your camera position, rotate it on the Y axis to aim at the scene root object. Now save the world position and rotation of the scene root, set its parent to your pivot object, and reapply the position and rotation. Set the pivot object's scale to (1, 1, -1) to flip it over your camera position. This will help for switching from back camera to front camera.
Switching from front camera to back camera will be a little harder because the tracking will try to reinitialize in the direction the user is facing. You can maybe counteract this by storing the position and rotation of the camera before switching to front camera, then when the camera switches to rear camera and tracking begins again, use these values to counteract the new position and rotation based on how far the user rotated in front camera.
Obviously, this is pretty difficult for someone to add to the current portal template. In the future we'll work on finding a way to make this easier. That could mean including it as an optional feature in the portal template.
Thanks for the suggestion!
Jacob