Email Notifications

Assume i created a new sheet and added email ids of my resources into a column X in smart sheet where the column X is assigned as contact column. I have created a workflow where any changes to the rows on other columns in the SS, should trigger an email notification to the assigned email id of the updated row from the column X. Right now, I am not able to see any notifications triggered for those email ids in the Column X. Is this because of sheet sharing issue or license issue of the resources?