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Look at the ARM reference documentation and verify the field under the API version.

<https://docs.microsoft.com/en-us/azure/templates/microsoft.sql/servers?tabs=bicep|https://docs.microsoft.com/en-us/azure/templates/microsoft.sql/servers?tabs=bicep>

If it not on latest, then you will have to specify the version in Pulumi.

<https://www.pulumi.com/registry/packages/azure-native/version-guide/|https://www.pulumi.com/registry/packages/azure-native/version-guide/>

Thank you for this reply, this solved my issue.