If you want to export those logs to your SIEM via syslog you need to have a Syslog Export Filter (Administration - External Servers - Syslog Export Filters) set using the Export Template "Audit Records". Here is an output from that;
Jun 27 15:03:12 2023-06-27 15: 03:12,373 X.X.X.X CPPM_Audit_Record 956 1 0 Timestamp=Jun 27 2023 15:03:01.965 EDT,EntityName=<Service Name> Wireless,Category=Radius Enforcement Service,Action=MODIFY,User=waltr