How to Fix Missing Emoji Icon on Apple Keyboard
Step 1. From the Home Screen of your iPhone, tap on Settings.
Step 2. Next, tap on General.
Step 3. On the next screen, tap on Keyboard (See image below).
Step 4. On the Keyboards screen, tap on Keyboards.
Step 5. Next, tap on Add New Keyboard.
Step 6. On the next screen, scroll down and tap on Emoji.