I was working on a deployment today and ran into an issue with a keyvault reference. In the app service the keyvault reference showed that it wasn't able to get the secret. The reference seemed good but I wasn't seeing what I wanted to see which was a couple of green checkmarks
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The managed identity on the app service had only GET access to the keyvault. I added LIST access and the reference started working. I'm not sure why this is but I'm guessing that the reference is doing a LIST to get the secret and then a GET to get the secret value.