Does Fortanix DSM support PKCS#12 ?

Yes, Fortanix-Data-Security-Manager (DSM) supports PKCS#12 (PFX) files, which contain private keys, certificates, and associated certificate chains. However, it does not support uploading PFX files through the user interface (UI) or REST API. The only method for importing PFX files is using the sdkms-cli. Currently, there is no functionality to export keys or certificates as PFX objects from Fortanix DSM.