Hello Abi2345,
1. If not yet completed, please update to iOS 13.4.1: Update your iPhone, iPad, or iPod touch - Apple Support
2. Also ensure your Apple Watch is updated to watchOS 6.2.1: Update your Apple Watch - Apple Support
3 . Next, ensure you are sending messages correctly using these two articles:
What’s new in watchOS 6 - Apple Support
"Animoji and Memoji support You can now add Animoji and Memoji stickers to messages sent from your Apple Watch. See Send messages."
Send messages from Apple Watch - Apple Support
- "Send emoji: Tap , tap a category, then scroll to browse available images. When you find the right symbol, tap it to send.
- Send an Animoji: Tap , then tap an image in the Animoji Stickers collection. When you find the right symbol, tap it to send.
- Send a sticker: Tap , scroll to the bottom, then tap More Stickers. Tap one to send it. To create new stickers or see all your stickers, use Messages on your iPhone."
If you still have issues, please let us know the iPhone model and iOS you are using with your Apple Watch.
Identify your iPhone model - Apple Support
Find the software version on your iPhone, iPad, or iPod - Apple Support
Thanks and have a wonderful day.