My emoji is not showing on my keyboard on a iPhone 7

When you went to Settings > General > Keyboards, do you see Emoji listed as one of your keyboards?

See this, which might help you --> Add emoji, Memoji, and stickers with the iPhone keyboard - Apple Support

• Open the Settings App
• Tap General, then Keyboards
• Add the Emoji keyboard

What happens when you tap the globe button to the left of your microphone button as the support article I linked told you to do?

Strange - mine stopped working on Mac, but is OK on iPhone.