Tests generally are not reliable. I am pretty sure tests have given me every single Enneagram type before (except 8 and 2). Off the top of my head, I have definitely gotten 1, 3, 4, 5, 6, 7, and 9. Same goes with MBTI (I have tested as INFJ, INFP, ENFP, ENFJ, ENTP, a rogue ISTJ result, (and probably more) most commonly I get INFJ or INFP even though I'm an ENFP. I tend to get J results as I don't act like a stereotypical perceiver and I tend to get I results as my E/I distinction is very narrow and blurry.
I am an ENFP 6w7. I've encountered ENFP 6s before. But I think that ENFPs are more likely to be other types first.
There are interesting combinations out there. A lot of people associate 2 with Fe for example, but a lot of ESFJs are 6s (although one of my best friends is an ESFJ 2w1 sx/sp).
I have another friend who is an ISFP and a 9w1. This is pretty common, but I really thought she was a 1w9 at first. But she described how her actions in our younger years when we first met in our early teen were pretty much textbook unhealthy 9 behavior, and it dawned on me. ISFPs use Fi, which is thought to correlate to type 4 yet a lot of them are not 4s.
I'm pretty sure one of my roommates is an ENTP 2. She types herself as an INFP and a type 2. The type 2 fits really well. But the INFP typing just doesn't fit her. I suspect she thinks she is a feeler because she tends to rely a lot on her tertiary Fe (which combines with her being a 2) and isn't looking deep enough into cognitive functions. She apparently also hasn't realized how different she blatantly is from two of my closest friends at school who are INFPs in terms of disposition and thought process. I actually thought she was a type 8 at first. But 2s under stress look like 8s, so this makes sense (I have two friends who are 2s that when stressed really seem like they are type 8). I just let the whole issue of mistyping go, frankly, it isn't worth debating over. The other of my roommates seems to be an ESFP 7w6 so/sx.
Technically, Ennegram and MBTI are separate systems. So I guess any combination is theoretically possible. But there are bound to be less common combos.