@jatinderp.enest
Please check if the below apis of Okta dotnet sdk can help you.
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Generates a one-time token (OTT) that can be used to reset a user’s password
Interface IUsersClient | Okta .NET SDK API Documentation -
Sets a new password for a user by validating the user’s answer to their current recovery question
Interface IUsersClient | Okta .NET SDK API Documentation