Custom Cert Authentication not working with SWA deploy

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**Describe the bug**
On the Static Web App documentation there is a sample using cert-based authentication:


[Custom authentication in Azure Static Web Apps | Microsoft Learn](https://learn.microsoft.com/en-us/azure/static-web-apps/authentication-custom?tabs=aad%2Cinvitations)

It uses the clientSecretCertificateKeyVaultReference property. But when I run swa deploy I am getting errors saying that is invalid:


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**Expected behavior**
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