I considered it in the past, but went with iNFJ over it. The enneagram I identify most with is E5, but I am very 9ish too. Because of a lot of people being of the school of thought that INFx 5 isn't possible, I'd been bouncing around other types. I took a cognitive function test a while back, I can try to find if it's still around. People who I know IRL and know me well and are familiar with typology say they can see INTP, as well as some people who I've talked to on Discord.
9 is more common in Fs but in general among the population, it is one of the most common enneagram types along with 3 and 6. A lot of people had suggested 9 for me before but INFx 9 doesn't quite seem to fit 100% percent. and INTP 5 definitely isn't right either, while I identify with enneagram 5 on it's own.
Cognitive function test... yeah ti second INFJ. I think fe should be a bit higher than it is but the rest seems good, and I can be pretty ne-ish so ne should be higher. But the score for ne could have been worse too.
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and another test not cognitive functions but another test I believe based on form M:
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