Cannot connect to db on PGAdmin (TrueNAS)

I’m attempting to connect to the Immich db via PGAdmin on TrueNAS to restore a backup. The server details were previously available in the app info for TrueNAS Dragonfish, but they do not show in Fangtooth. I’ve tried the previous server info and the credentials on the Databass GUI page of Immich, but neither would allow me to connect to the server. How can I connect?