Hey
@wingnut8 are you having this issue with both SMS/MMS Txt messages and Apple iMessages? If both are impacted, it may be that LTE Data is not provisioned on your LTE watch since both messaging solutions share LTE data to both send and receive messages.
The key may be in how your wearable unlimited plan was provisioned for your LTE watch. Did you complete the activation via self-service activation on your iPhone or did a carrier rep setup your wearable plan for you LTE watch?
Note: *SMS/MMS text messaging requires that your synced smartphone must be powered on so SMS/MMS messages may be forwarded to your watch. iMessage must be enabled and your smartphone must be connected to the carrier's network via either a cellular or Wi-Fi connection.
Note: To use iMessage, you must be logged into the same iCloud / Apple ID account on your iPhone Settings and also on the Watch app on your iPhone.
Dave