Hi there Goodiehike,
We'd like to get you started in the right direction for assistance. It sounds like you're having some issues with Activity Sharing on your Apple Watch. Before we get started, if you're experiencing this behavior with particular contacts, we'd suggest having them follow the same steps on their own device.
First, let's restart both the iPhone and Apple Watch that you're experiencing this behavior with using:
You mentioned that you recently changed devices so let's ensure that each device is on the latest software update, since that can often resolve abnormal behavior:
If you're still unable to see your friends in the Activity app, to look into this further, use the following link to reach us: Get Support
Take care.