creating bulk users and Adding array of bulk users to group through code

I highly suggest to create a process model to create users and add them to groups.

But first, make yourself familiar with Appian by attending the Appian Academy trainings. Assuming that you are coming from traditional software development, it takes a bit to change your way of problem solving.

to create user & adding them into group use Process models, in process model there are smart services to create user & add user to Group use them. If you are creating multiple users, then use looping or MNI to achieve it 

errors in your code->

1. in your  a!foreach there are 6 items , not 2 and the indexes you are accessing doesn't exist in this case.
2. Create a new user, This function will only execute inside a saveInto or a Web API .