There are a few things you may need to further answer and check to see if you have un-commented out the appender earlier in the log4j*xml I put * now that they have moved to log4j2.xml in the latest (8.0.1) release.
<appender-ref ref="SecurityAudit2Splunk"/>
should go where SecurityAudit2File is on the line below.
You also have to do this for every configuration, Do a search for `` and update every config that you want this active for (*Sp, Idp, OAuth, etc.)
Example for SP Audit Logging, Should look like:
Logger name="org.sourceid.websso.profiles.sp.SpAuditLogger"
level="INFO" additivity="false" includeLocation="false">
<appender-ref ref="SecurityAudit2File" />
<appender-ref ref="SecurityAudit2Splunk"/>
*Remember to do this for any Audit logging configuration you need to see logs for.
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