Support for KMIP protocol
KMIP is a standard protocol for interacting with vaults. It's supported by major vendors including NetApp. Keyvault should support this feature to allow centralized key management.
Richard Hubert commented
Without support of KMIP in Azure Key Vault (AKV), we cannot leverage AKV together with Azure IoT-Services in a virtual machine environment so the E2E solution from Azure is broken at that point. VMs cannot have a hardware TPM, they require the virtual (Key Store) solution to provide a virtual TPM option.