I posted about the VNO at this link below. It seems to point to evidence that we just detect pheromones through our normal olfactory system and not the VNO. Only someone who has something extreme like nasal polyps that couldnt smell at all would be immune to then detect pheromones.
https://pheromonetalk.com/t/vno-is-not-involved-in-human-processing-of-putative-pheromones/67298/1
About 50% cant smell it at all. For the rest, there are two main genetic variants, an RT code where people had stronger response and found it more of a negative urinous/sweaty smell (but more neutral during ovulation for these people), and a WM variant that is a impaired reaction and describe it as more sweet and pleasant, floral type smell. For those who have a neg reaction, a pleasant cover scent or the ‘stealth’ cover should work better. In my experiences it still effects them in their body chemistry, they just also get a conscious dislike for the scent