Windows Server File Auditing Condition

Hello

i am trying to audit all file accesses for a specific folder structure (right-click on folder --> Properties --> Security --> Advanced --> Auditing) but i want to exclude one single user (service account "acct.deletefiles", deleting old files based on a schedule).

My understanding is that i have to add an condition to the audit-rule as below:

https://imgur.com/a/GNQ5DJl

User     Group      Not member of each        Value        1 item(s) selected

"1 item(s) selected" is an Domain Local Active Directory Security Group in which account ".acct.deletefiles" is member of.

Nevertheless, all file accesses for this user are logged, what am i doing wrong?

Thanks in advance