Just recently revamped a lioness of mine with a Basic Primal mutation but she’s not showing the Ritual Omen marking on her page nor in her wardrobe.
Main page (look closely to the right of the lioness’ back leg to see broken image icon) :

In Wardrobe with marking on:

In Wardrobe with marking hidden:


I tested the other Omen markings with male and female Basic Primals and came to the conclusion that none of the Omen markings appear on the female and only Noctis Omen appears on the male. This was tested on PC and mobile (not sure if that’s relevant but wanted to add as much info as I could that might be helpful). Also, I asked others in the chat box about the issue and one person confirmed they *could* see the marking so I’m not sure if this is only an issue on my end.