Hello Sun Tongxin3
Welcome to Microsoft Q&A Platform, thanks for posting your query here.
Please kindly avoid using the command Add-AzServiceFabricClusterCertificate
to apply the certificate upgrade/change on any production environment.
As mentioned here(https://video2.skills-academy.com/en-us/powershell/azure/migrate-az-6.0.0?view=azps-12.0.0&viewFallbackFrom=azps-11.5.0#add-azservicefabricclustercertificate), this command has already been removed. So there will not be any further upgrade/maintenance about this command.
The official recommended way of upgrading cluster certificate is in this document (https://video2.skills-academy.com/en-us/azure/service-fabric/service-fabric-cluster-security-update-certs-azure#add-a-secondary-certificate-using-azure-resource-manager).
Hope this helps.
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