We have added a user to our enterprise office365 account , We were able to send a few emails but when we are trying to send more emails using ews api we are getting the below exception
microsoft.exchange.webservices.data.core.exception.service.remote.ServiceResponseException: Access is denied. Check credentials and try again., Cannot save changes made to an item to store.
Could someone please point if we need to provide additional permission to this user to send emails , if so could you please let us know which permissions to provide
Updated this user with admin role but still no luck getting the same exception