1. What is the nature and description of the request?

The issue is when using multiple credentials of the same type on job temaplate, the controller tries to run job on nodes listed in the selected inventory file via "user1" only the other user "user2" is not getting considered on job run and job gets failed because the user1 doesn't have proper and necessary permissions to access the particular servers for successful ssh connectivity.
~~~
user1@xx.xx.xx.xx: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password,keyboard-interactive).", "unreachable": true}
~~~

1. Why does the customer need this? (List the business requirements here)

Cu would like to use multiple credentials of same type that have different configurations for ex. username and password differ on credentials used on the job template causing permission denied issue on SSH connection because user connecting to the remote server doesn't have proper and necessary permissions to access the particular servers

1. How would you like to achieve this? (List the functional requirements here)

If the SSH connection to remote hosts fails with first credential selected on job template then AAP should try using the next credential selected on job template.

Currently, multiple SSH keys are allowed, but multiple usernames is not possible. So filing a feature request, tying all username of the credential configured at the job template on AAP.