How to connect Dexcom G7 Direct to Watch?

I’m quite new to the Dexcom G7. The first time I tried it, it connected to my watch. The second time is being a right nightmare. I changed my sensor yesterday and I’ve been trying to pair it with my Apple Watch with no luck at all…it keeps saying searching for sensor and takes over 5 mins to do so, and then it says ready to pair, even though it won’t let me do that, so I’m at a loss of what I can do 🤷🏻‍♀️