I’ve used icey before so I dont know it’s more your preference.I could only find one online dictionary that accepted "icey" as an alternate spelling, and even then, it was listed as a "rare" alternative. Some other sources list "icey" as a misspelling altogether.
This isn't like "center" and "centre" where significant amounts of people use either form. A vast majority of English speakers, if not all of them, use "icy" as their way of spelling it, and I think the server should reflect the far more common spelling in this case.