DigiDoc3 Client error: "Failed to sign container"

When signing a document with DigiDoc3 Client you may get the error message "Failed to sign container" and see the following text displayed under "Show Details...":

BDoc.cpp:508 Failed to sign BDOC container.SignatureTM.cpp:242 Could not find certificate issuer 'CN=ESTEID-SK 2015,,O=AS Sertifitseerimiskeskus,C=EE' in certificate store.

The error is most likely caused by the old ID software version (lower than 3.12) installed on your computer. To solve the issue, install the latest ID software that can be downloaded at https://installer.id.ee/?lang=est


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