Could not find appropriate signing identity

I am attempting to sign a *.pkg for distribution but I get "Could not find appropriate signing identity for 'Developer ID Application: CompanyName'.

I'm calling this command to sign: productsign --sign 'Developer ID Application: CompanyName' "unsigned.pkg" "signed.pkg"

I've downloaded the WWDR Intermediates, when I go through Keychain Access > Certificate Assistant > Evaluate on the cert and select "Code Signing" I get "Evaluation Status: Success" and "Certificate Status: Good". Additionally my certificate shows up as valid in my keychain. I'm at a loss for what is going on.

You’re using the wrong signing identity. Installer packages must be signed with your Developer ID Installer signing identity. For lots more details, see Packaging Mac software for distribution.

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

Could not find appropriate signing identity
 
 
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