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The docs say that for creating a keyvault secret that the -value isnt required but it is required.

Document Details

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• ID: 39cfb8ed-c246-2ffb-9dff-070b90c18b21
• Version Independent ID: c09c1597-1b6c-b0a2-b3fc-bdc16764d096
• Content: az keyvault secret
• Content Source: latest/docs-ref-autogen/keyvault/secret.yml
• Service: key-vault
• GitHub Login: @rloutlaw
• Microsoft Alias: routlaw