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Try

PrimaryEndpoints.Apply(v => v.Blob)

Thank you very much, that seems to work, although it got me a bit confused. I guess it makes sense because I'm not retrieving the storage account explicitly, only accessing the Outputs of its creation (which is almost the same thing but with the added Output wrappings).

Output is sort of like a Promise/Task/Future - it’s a container for a value which gets resolved at some point. And

Apply

is the way to convert it to another value that can then be assigned e.g. to an input of another resource.