The JTDX log file signature and automatic upload.
Default location: C:\\Users\\<Your Windows Username>\\AppData\\Local\\JTDX

Export the certificate, [Save callsign certificate as...], set a password for the certificate file, and enter that certificate file's password in the "tqsl" password field.

If the grid or other information has changed, it may also fail. If that happens, simply update the certificate: "Update call sign certificate to...", download a new certificate from email and import it, then sign and automatically upload the jtdx log file.