Why can't signtool find certificate in machine store?

We have a code signing certificate that is working in TeamCity builds using the following command:

signtool sign /a /v /sm /s my /n "NAME_ISSUED_TO" /d "DESCRIPTION" FILENAME

Unfortunately the person who set this up is no longer here and we need to reconfigure things. We are currently trying to run the command from a console on the machine and we get the following error:

SignTool Error: No certificates were found that met all the given criteria.

The certificate is stored in the "Local Computer" area of the certificate store which is what I understand the /sm command relates to.

Any ideas why it wouldn't work from the console?

Thanks, Alan

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