Subject Mapping

I have a database which is its own security database. I now want users in the default security database to have access. So I created a mapping:

create global mapping TrustedUsers

using plugin Srp in "security.db"

from any user to user

This is based on the example the example in the release notes. But users in the default database are unable to connect.

Is there another step? Have I misunderstood something?