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Trouble launching channel in 1080p

 I am new to Roku development, and just working on my first Scenegraph app. I can not get my app to launch in 1080p (fhd) mode. I have the following in my manifest file:
ui_resolutions = fhd
but the app still launches in just hd. The app contains just a simple postergrid, and I can tell from the basePosterSize settings I put, it is using the hd settings for sizing.
Am I missing somewhere else that it needs to be defined?
I am testing on 2 different roku devices (one roku express and the other a Roku player 4660X
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