GoDaddy Code Signing and Driver Signing Certificates no longer issued or renewed after June 1, 2021

I would check the SignTool docs, here:

I think you need to include the /td and /fd options as well, and the order matters on those. It’s supposed to throw a warning if they’re missing, though, so you seem to be hitting another error first.

Oh, maybe try /tr instead of /t for the option where you provide the server URL.

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@refusesoftware - actually the cmd.exe /k was tripping me up. As soon as I removed that it signed just fine. I did end up using /tr and /td, too, in place of /t. Thanks for all your help. I now have the OV certificate in place.