I agree with @Jizz
He is often chosen to work with different spirits related to love/sex stuff in more formal way of working, I think that’s usually not a problem when it comes to group workings. But Dantalion from my experience is kinda an “individualist type” and prefers to work with the person alone, when he is not disturbed by other spirits and can use his more specific and personal tools for working with a person. Doesn’t like to be disturbed or maybe he just likes to have full attention idk.
That is always my impression and what I noticed, I also often hear of situations when he comes by order or recommendation of other goetic or infernal spirits, but it’s more in a way of letting him work alone. Tho, don’t block yourself on potential working with many spirits including Dantalion, because there can be a reason their union would just work better for you or they choose it like that for your good.