[Fuzzy Wuzzy]

So I saw a really good deal on a Crucial MicroSD card from Buy, and jumped on it.
It arrived today and the first thing I did was pop it into the phone, but no go. The light would turn on as if I put in any other memory card, but it doesn't show up in file explorer at all.

I've formatted it, hard reset, 3.16, 2.17, etc. and it works perfectly on the computer but just not on the phone. Heck, I even installed the SDHC drivers.
Any help?
Thanks!