My Memoji is missing on my iPhone since the last update.

Hi MCRudin,

Welcome to Apple Support Communities. Just to confirm, you don't have the Memoji button at all in your Message conversations? These steps will help you tell:

1. "In a conversation, tap , then tap .
2. Tap each feature and choose the options you want. As you add features to your Memoji, your character comes to life.
3. Tap Done to add the Memoji to your collection.

To edit, duplicate, or delete a Memoji, tap , tap the Memoji, then tap ."

Use Memoji in Messages on iPhone - Apple Support

If so, select "Edit" to add the Memoji and Memoji Stickers in the app tray.

We hope this helps.

Cheers!