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The statement indicating that users must keep the master key securely is misleading in the context of Alibaba Cloud Key Management Service (KMS). KMS is designed to manage cryptographic keys securely, and one of its key features is that the management and protection of the master key are handled by Alibaba Cloud itself. This means that users do not have to directly manage or keep the master key secure; instead, they can rely on KMS for the secure handling of this important cryptographic asset.

In contrast, the other statements accurately depict the functionality and purpose of KMS. It indeed employs envelope encryption technology to enhance data security by encrypting data keys with a master key and managing them efficiently. Additionally, KMS provides robust encryption and management capabilities for data across various Alibaba Cloud services, allowing users to protect sensitive information with less concern about directly managing the underlying key material. Thus, the assertion that users must keep the master key securely does not align with KMS's design, making it the incorrect statement.