Dovecot 2.4. field lookup for sqlite_path?

Good day Guys

Reading: https://doc.dovecot.org/2.4.1/core/config/auth/databases/sql.html#sqlite

Im trying to do a field look up but I get the following error message

Failed to parse configuration: Failed to expand sqlite_path setting variables: dom ain: No value to get domain from

This is what I have

passdb sql { query = SELECT name AS username, password FROM mailboxes WHERE name = '%{user | username}' sqlite_path = /usr/home/.mail/%{domain}/mailconf.sq3 }

If I hard code the path, then the error message goes away

Regards Brent Clark