After that I used the following syntax in Exchange Online PowerShell to save the SST file contents in the Exchange Online virtual certificate store: Set-SmimeConfig -SMIMECertificateIssuingCA (Get-Content "file path" -Encoding Byte)
When running the cmdlet Set-SmimeConfig in PowerShell, it shows "0" values for the attribute "SMIMECertificateIssuingCA" (pls. check the screenshot as well). So it means, that the certificate was not adopted.
What I do wrong here? Can somebody try to reproduce this issue?