You have an Ansible module that uses a database module. When you run the playbook, you get an error about a user being unable to authenticate when this database module is run. What could be wrong?
Is the user in the error message a user that is created via the playbook? If it is, does that user get assigned a password? The password must not be clear text. Here is an example of an incorrect attribute for the password attribute:
You must use a hashed password. It would look something like this:
To obtain this hashed password (and know what the value actually is beforehand), follow these instructions.