Plex sound output different from TV Roku vs Roku Express

I have a TCL tv with Roku built in, and a Roku Express both hooked up to the same Receiver.
When I play the same movie on both Roku devices, the Audio is different.

From the built in Roku Plex App on the TV, the audio works in surround (5.1) through the Denon receiver.
From the Roku Express, the audio only works in Stereo even though the receiver says Dolby Digital.

Does anyone know what I need to change on the Roku Express to get the sound in Dolby as well?

Thank you.
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