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Azure Data Factory
An Azure service for ingesting, preparing, and transforming data at scale.
Hello Oliver !
Thank you for posting on MS Learn Q&A.
This looks like a preview bug not a usable activity configuration screen.
I think it looks like a developer placeholder that accidentally shipped in the ADF authoring UI. I would not rely on this Azure Key Vault Activity for production until Microsoft documents it or the Settings tab exposes real properties.
For now, you can store credentials in Key Vault and referencing them from linked services.
https://learn.microsoft.com/en-us/azure/data-factory/store-credentials-in-key-vault
Or you can use a Web Activity to read a secret during a pipeline run where you call the Key Vault secret URI using a Web activity with Managed Identity authentication : GET <secret-uri>?api-version=7.5, authentication = managed identity, resource = https://vault.azure.net and enable Secure Output.
The factory managed identity needs Key Vault secret permissions such as Get and usually List, either through access policies or IAM role assignment such as Key Vault Secrets User.