Unable to respond to text message notifications or text people using S Voice.

I recently received a Gear S2 (paired to an LG Nexus 5X) and I have been unable to text people via S Voice (I receive a message stating that SMS Service is unavailable) or respond via notifications. However, I am able to text people through the "Buddy" and "Phone" applications that were pre-loaded on the watch.

Is this a compatibility issue with the phone I'm using or something else?

Thanks!

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