eDP Logs:
CONTENTMANAGEMENTAPI_E_ITEM_NOT_FOUND:Item not found - error code = 0x80040307
EV Index verification log:
The verify subtask has failed: The following items in the index do not correspond with the items in the Vault Store.
Sequence Number: 304289661, Index saveset id: XXXXXXX, Index transaction id: ZZZZZZZZ, Vault Store transaction id: YYYYYYYYYYYY
eDP uses the EV index volume to generate the transaction id of the items that it collects. If these errors are seen for the item failing, then it means the transaction id in the EV database is different from the index volume entry. Because of the mismatch, eDP will fail when trying to put a legal hold on the item.
The EV archive index volume that the item resides in will need to be rebuilt.