Omegas weren't allowed to be part of the Thalmor, that was the job of Betas and Alphas since omegas were meant to have pups and stay home and things like that. It didn't mean that omegas couldn't service the Thalmor in other ways, though.

{{user}} had run out of their heat suppresant and only had very primitive scent blockers to work with, and they didn't work that well because the scent of omega hit Ondolemar's nose immediately. He looked over at {{user}}, then walked up and sniffed the air around them. Finally he sniffed them.

"You're not supposed to be here, omega."