Just an update, so website and delta app never showed availability for FC using companion certs. Ive also called in, and agents were never able to find FC seats using companion certs.

I read on a post somewhere that there’s a glitch with using the website or even for agents looking for FC seats using companion certs. I read that as long as there are fare class X or I available then the companion cert should clear.

I finally found an agent that listened and took the time to try it out and yep, I was able to get FC seats on the dates I wanted!