I'm trying to implement ACME managed device attestation, I have ACME server code written in C# and I've been able to get all of the steps working except for the very last one - issuing the certificate. I so far have not been able to get the device to accept the certificate, the device logs show: Got certificate {length = ......} ACME request flow failed at step 9: Error Domain=NSOSStatusErrorDomain Code=-67673 failed to obtain certificate UserInfo={NSLocalizedDescription=failed to obtain certificate} The certificate is issued by an internal CA and the correct root certificate is in the device's trusted certs. I have tried returning the certificate chain as a file response or content response to the device as a application/pem-certificate-chain mime type (as outlined as the default in the ACME RFC), returning just the leaf certificate as PEM, returning the leaf certificate as DER with mime type application/pkix-cert, application/pkcs7-mime, application/x-pkcs12 or applicatio
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