Overview:
Changes made to the Sharing Settings by Dynamic Access Control (DAC) are not recorded in the Document Audit Trail.
Root Cause:
This is working as designed.
Solution:
Updates to DAC groups, DAC group membership, and Sharing Settings updates by DAC are not audited in Vault. Therefore, they are not recorded in the Document Audit Trail.
Related Documentation:
Vault Audit Trail Documentation: Document Audit Events
Thank you