In https://github.com/Azure/azure-rest-api-specs/blob/master/specification/attestation/resource-manager/Microsoft.Attestation/stable/2020-10-01/attestation.json#L665, object `AttestationProvider` is only used in response. So its paramter `properties` should not be marked as required in swagger. The simple solution is just delete line 667-669.