Test Functional Account result

Hi All,

I need to test the functional account test on multiple system. Systems are more than 500 and all systems are non domain joined. I need to test password and create the report. Post that I will work with respective team to get it sorted. However currently testing one one system it is very difficult.

I want to understand 

1. how can I do testing of functional account in bulk
2. Is there any API available to do functional testing in bulk.

I need help here please to understand how can I resolve this issue ?

Regards,

Immi