Star Trek Discovery: Every Easter Egg & Hidden Reference From 'People Of Earth'

While the United Earth of the 32nd century is isolationist, even excluding former Earth colonies such as Titan, it's not comprised of humans exclusively.

As Earth Defense Force inspectors board the Discovery, a Tellarite officer beams onto the bridge and a new alien species beams into engineering.

Tellarties were previously seen in "That Hope is You" on Hima and referred to has having their own exchange in "Far From Home".