Thanks for the link. I tried to search for similar threads, but I guess somehow that one escaped me. Mods can feel free to merge if desired.
A couple of things from reading that other thread:
1. They mentioned that the Booking Class for the certificate should be listed in your account on Delta.com. My certificate was issued on January 6, 2019, and the "Booking Class" column just reads "DL - See Terms"
2. The one example of someone being issued a Z-class ticket sounds like the original ticket was booked in A
Does anyone currently have a Reserve Companion Certificate in their account that lists "Z" in the Booking Class? Or has anyone been able to create a booking into Z (even a dummy booking) using their Reserve Companion Certificate?