Just an update: After speaking with a T-Mo CSR, it seems that the issue has been resolved by plugging in the AKG buds that came in the box, as opposed to using my other headset. It's weird, and I'm not sure if it's a factor, but when I was using the Nexus 6P, I always had issue with using Samsung headsets, because of the silver connectors they have. Google Assistant would always be triggered. Now, I had to switch from using a headset with a gold connector, back to silver. Strange, but whatever works.
That's Interesting, but glad it's fixed.