Automation Workflow Not Consistently Working


Hi! I set up an automation workflow on a form I created in Smartsheet. I have tested it twice; with one group it worked and each person received the email notification to approve or deny, however, the other group no email notifications were received to take action. I did not update the workflow between test groups and the activity log looks the same for each group. Would anyone have any insight on why this was not successful with both test groups? Thanks!