AWS Lambda RDS Proxy - Not able to select RDS Instance

I am not able to select any RDS instance from my lambda to setup a database proxy.

I already created 3 different types (mysql, mariadb, aurora) and it never shows me a RDS instance to select.

What do I have to do to be able to select a RDS Instance to create a proxy from Lambda?

SOLVED

The problem was that I was not using MySQL 5.6 or 5.7 version. It ONLY works with that versions.

Now my problem is timeout.