iOS signing identity dropdown not populating

I need to use a different mac computer for building an existing iOS app with DAB.

I signed into my Apple Developer account and downloaded my existing signing certificate and provisioning profile.

I added the certificate to Keychain Access under “identity”. I downloaded the latest certificate authority and everything is valid when I look at it in Keychain Access.

When I go to DAB, however, the dropdrown for selecting “Signing Identity” is empty.
I have hit “refresh”, closed and reopened DAB, and restarted my entire machine. Still no luck.

Any thoughts on why DAB can’t see the cert?