After uploading the PushCertificateRequest.plist file in the "Create a New Push Certificate" form under Apple Push Certificates Portal, we get "Certificate Signature Verification failed" error with details as: "Certificate Signature Verification failed because the signature is invalid." We are making use of our Apple Enterprise Account for setting up MDM server, and the enterprise license has been expired on July 14, 2020 and we have renewed it on January 31, 2021. With the renewed enterprise license, we attempted to create a new push certificate afresh using the fresh MDM CSR and it is failing since then, even though we use exactly the same procedure like before. The push certificate which was successfully created last time has expired on Jan 12, 2021. We are using the MicroMDM for setting up the MDM and any guidance would be much appreciated. And we're not using old MDM CSR which seems to be a common pitfall as we started completely afresh.