Here's a description of some issues involved with Apple's T2 security/storage processor:
CrystalIDEA said:Fan control on Apple computers equipped with T2 chip on Windows (via Boot Camp)
... The introduction of the new T2 security chip makes it currently impossible for [our] app to work under Windows (iMac Pro and MacBook Pro 2018). ... It seems that the T2 chip blocks access to SMC under Windows, while SMC is essential to get sensors values and fans info.
We confirmed the problem themselves on both iMac Pro and MacBook Pro 2018. Unfortunately, we believe it won’t be solved in the future, though there’s a GitHub issue.
PS. There’s another restriction of the T2 chip not related to the app: it’s currently not possible to install any 3rdParty operating system except Windows 10 on Apple computers equipped with T2 chip (earlier some enthusiasts installed Linux). The T2 chip makes it impossible to see the internal drive, Apple generously did an exception only for Windows 10 (but only if you install it via Boot Camp).