That is the nature of the set diff command - it will tell there's a difference, but doesn't say what it is. See https://docs.splunk.com/Documentation/Splunk/9.3.2/SearchReference/Set An alternative would be to count the members of each group and show those with only one member. | multisearch
[ search index=db_assets sourcetype=assets_ad_users $user1$
| dedup displayName sAMAccountName memberOf
| makemv delim="," memberOf
| mvexpand memberOf
| rex field=memberOf "CN=(?<Group>[^,]+)"
| where Group!=""
| eval User=$user1$
| table Group User ]
[ search index=db_assets sourcetype=assets_ad_users $user2$
| dedup displayName sAMAccountName memberOf
| makemv delim="," memberOf
| mvexpand memberOf
| rex field=memberOf "CN=(?<Group>[^,]+)"
| eval User=$user2$
| where Group!=""
| table Group User ]
| stats values(User) as Users by Group
| where mvcount(Users)=1
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