Can't Connect Guacamole Docker to Database Cluster

Sorry if it seems elemental, but this is driving me crazy, I have done this in Digital_Ocean, my own Home Servers, Office Remote Server and this is the first time I can't set Guacamole using their official Docker Container connected to an External PostgreSQL Database, so considering I set a Cluster right here in Linode I can only assume it's Linode related.

I'm running the guacd container with:

docker run --name guacd -d guacamole/guacd

Then the Guacamole container with the following environment parameters so it can connect to an external PostgreSQL Database:

docker run --name guacamole -p 8080:8080 --env POSTGRES_HOSTNAME=my-linode-private-database-cluster --env POSTGRES_DATABASE=guacamole --env POSTGRES_USER=guacamole --env POSTGRES_PASSWORD=MyPassword --link guacd:guacd -d guacamole/guacamole

Once I try http://my-linode-ip:8080/guacamole I get on the docker logs this error:

Error querying database. Cause: org.postgresql.util.PSQLException: FATAL: no pg_hba.conf entry for host "pri.va.te.ip", user "guacamole", database "guacamole", no encryption
The error may exist in org/apache/guacamole/auth/jdbc/user/UserMapper.xml
The error may involve org.apache.guacamole.auth.jdbc.user.UserMapper.selectOne
The error occurred while executing a query
Cause: org.postgresql.util.PSQLException: FATAL: no pg_hba.conf entry for host "pri.va.te.ip", user "guacamole", database "guacamole", no encryption

Same result if I try to do it with the External IP, the one not Private. only change is the IP number on the Error.

Both IPs are on the list for Access Control in the Cluster Database, , my own current Home IP is also set and I can access the Cluster with no issues via:

psql -U guacamole -h my-linode-database-cluster -d guacamole --set=sslmode=require

Why would I be required to give access manually via the pg_hba.conf (that I don't have access to in the cluster)? and why would connections originating from the same Data Center in Linode be blocked while External ones connect just fine? even to the same Cluster