{Resolved}I can't connect to Postgresql (Omibus)

Troubleshooting
1

Summary
Installed via Omnibus
As root I’ve tried:

psql --host=127.0.0.1 --dbname=mattermost_test --username=mmuser --password

with the default “mostest” as the password and I get:
psql: error: connection to server at “127.0.0.1”, port 5432 failed: FATAL: password authentication failed for user “mmuser”
connection to server at “127.0.0.1”, port 5432 failed: FATAL: password authentication failed for user “mmuser”

I’ve tried as su -u mattermost as well.
The config.json in /opt/mattermost/config/config,json shows:

"SqlSettings": {
        "DriverName": "postgres",
        "DataSource": "postgres://mmuser:mostest@localhost/mattermost_test?sslmode=disable\u0026connect_timeout=10",
        "DataSourceReplicas": [],
        "DataSourceSearchReplicas": [],
        "MaxIdleConns": 20,
        "ConnMaxLifetimeMilliseconds": 3600000,
        "ConnMaxIdleTimeMilliseconds": 300000,
        "MaxOpenConns": 300,
        "Trace": false,
        "AtRestEncryptKey": "###",
        "QueryTimeout": 30,
        "DisableDatabaseSearch": false,
        "MigrationsStatementTimeoutSeconds": 100000,
        "ReplicaLagSettings": []

mattermost export bulk bulk_data.json gives me:

Server is initializing...
Pinging SQL","caller":"sqlstore/store.go:218","database":"master"}
Failed to ping DB","caller":"sqlstore/store.go:228","error":"pq: password authentication failed for user \"mmuser\"","retrying in seconds":10}

mmctl config get SqlSettings returns
Error: cannot read user credentials, maybe you need to use login first: stat /root/.config/mmctl/config: no such file or directory

Literally no clue how the application is even connecting to the database when I can’t even connect…

— EDIT:
Found in docs that Mattermost Omnibus stores config in /etc/mattermost/mmomni.yml