You can bulk enable Password History for Passwords in bulk by creating a SQL query.
If you open SQL Management Studio > Databases > AuthAnvilPasswordServer > Tables > dbo.VaultTable
You will want to set the following values on the Vaults you want to enforce password history.
SaveHistory - Set the Value to True
EnforceHistory Set the Value to True
HistoryLimit Set the value to the number of passwords remembered.
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