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One of the Best ways would be to Create an Expression rule and Pass ER with Parameters so testing can be done by taking the data from pv's.
Potential issue which From the Snap can be seen like either if you are trying to take a batch form Usernames and need email. Test First Using Expression Rule By Passing the same parameters (its easier) and can easily find the issue .(Take Care of Nulls and pass it like toemailaddress(user(loggedInUser(),"email")) )