AWS Certificate Manager (ACM) Private Certificate Authority (CA) is now available in the Asia Pacific (Osaka) region. This regional expansion extends the availability of ACM Private CA across the globe, increasing the number of regions to 22. The Osaka region only supports CAs with the private key stored in a FIPS 140-2 level 2 HSM. To learn more about the key storage certification level see the AWS Private CA Documentation.
Source:: Amazon AWS