The settings are under iDRAC settings >Network, then the services sub tab.
However, in order to set passphrases that is done under User Authentication.
Under User Authentication you will select your user, and as you see there is an SNMPv3 column and it's disabled.
Then on the user profile page select Configure User and then click next.
There you will locate the SNMPv3 Enable check box and your passphrase type setting.
The passphrase is the password configured for the user.
Hope this helps.
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