Instant Pot® Pho

Name: Instant Pot® Pho
Ingredients: 3 pounds oxtail, or more to taste; 1 (1 inch) piece ginger, peeled; 1 medium onion, quartered; 1 cinnamon stick; 3 cardamom pods; 3 whole cloves; 2 whole star anise pods; 1 teaspoon coriander seeds; 1 teaspoon fennel seeds; 6 cups water, or more as needed; 0.25 cup fish sauce; 3 green onions, cut into 3 pieces; 1.5 tablespoons white sugar; 1 teaspoon salt; 1 (8 ounce) package dried rice noodles