Policy example [Get OAuth2 access token from AAD using client id and certificate using key vault manage identity](https://github.com/Azure/api-management-policy-snippets/blob/f647c32a7eaf392a9935e2fef9bb1d13a399207d/examples/Get%20OAuth2%20access%20token%20from%20AAD%20using%20client%20id%20and%20certificate%20using%20key%20vault%20manage%20identity.xml#L65) uses RSACng for its signing operations. However, per the [APIM Policy Allowed Types list](https://learn.microsoft.com/en-us/azure/api-management/api-management-policy-expressions#CLRTypes) this is not an allowed type and attempting to use this type in an APIM policy results in the error message `Usage of type 'System.Security.Cryptography.RSACng' is not supported within expressions`