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Hello Shaun_362,
Good day!
Thank you for posting to Microsoft Community. We are happy to help you.
After thorough research and testing from my end, i find out that you have choose to run specific stimulation for the user Attack Simulation Training.
And for the target user in your stimulation process you have chosen "include only specific users and group". Am i right? if yes there is no option to target users which not been targeted previously. You need to create new stimulation for those users.
Before you start you should prepare csv file for all user you are going to exclude.
The only workaround i find is always choose in the attack stimulation "include all users in my organization" and import the users file you want to exclude.
So next time if you want filter a list of users which not been targeted previously, then select whichever ones you want, to make a stimulation attack, you go to the report of the affected stimulation attack as the picture below:
And you will find the list of lists of users which not been targeted previously.
however, the way you are doing cannot give you, list of lists of users which not been targeted previously.
We apologize if we are not able to meet your requirements; however, thank you for bringing this to our attention, we will surely raise you concerns to our Product Team and hopefully this can be included in the future updates.
please feel free to let me know if there are any questions or if I've got you wrong. I will keep assisting you based on the information you provide. We sincerely appreciate your patience and cooperation
Appreciate your patience and understanding and thank you for your time and cooperation.
Sincerely,
Eben Ezer Tres | Microsoft Community Moderator