I'm trying to find out if this stroller is compatible with a Chicco KeyFit 30 car seat, or if an adapter can be purchased for use?
I am sorry to say that most - pretty much all the Hauck and iCoo strollers (iCoo is a sub-brand of Hauck) do not accommodate other brands' car seats, unfortunately. They are made so that they encourage you to get their own car seat, usually even fitted to the stroller model, not just one Hauck generic one - the attachment system differs from model to model so that the click-on system doesn't require any adapters.
So, the answer is no, sorry - this model is not compatible with the Chicco Key fit car seat line, nor any other Chicco car seat. The good news here is that the Hauck car seats are actually, in general, quite safe and rate reasonably well in ADAC and similar tests.