An Azure service that is used to manage and protect cryptographic keys and other secrets used by cloud apps and services.
Hi, Key Vault has separate management-plane and data-plane permissions. Owner/Contributor can manage the vault resource but does not automatically allow writing secrets. Check the vault's Access configuration: if it uses Azure RBAC, assign yourself Key Vault Secrets Officer (or Administrator only if genuinely needed) at the vault scope and allow a few minutes for propagation; if it uses access policies, add secret Set/Get permissions there instead. Also check Networking, because a public-network/firewall or private-endpoint restriction can produce a generic portal error. The activity log covers resource operations, while the browser/network response or Key Vault diagnostic logs will usually reveal whether the secret write failed with 403, networking, or policy denial.