code: public AdminGetUserResult withUserMFASettingList(String... userMFASettingList) {
          if (this.userMFASettingList == null) {
              setUserMFASettingList(new java.util.ArrayList<String>(userMFASettingList.length));
          }
          for (String ele : userMFASettingList) {
              this.userMFASettingList.add(ele);
          }
          return this;
      }
docs: <p>
  The list of the user's MFA settings.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setUserMFASettingList(java.util.Collection)} or {@link #withUserMFASettingList(java.util.Collection)} if
  you want to override the existing values.
  </p>
  
  @param userMFASettingList
  The list of the user's MFA settings.
  @return Returns a reference to this object so that method calls can be chained together.