Docker on AWS target doesn't seem to connect with MySQL

In the local development target I have docker and MySQL working well. When I switch to the remote environment target with docker on AWS, the connection test works fine but docker doesn’t seem to be connected to MySQL. For instance, the login (that checks for the user’s role in the database) doesn’t work, neither the registration form that posts to the database. The project settings are shown below:

image866×619 22 KB

Do I need to do some additional configuration on the database of the target? or is it something else?

Thanks in advance for your help.

Best.

Jay