I just got a new Linear GD00Z-4 from Amazon and trying to pair it with my ST hub v2. However, I am not able to add the Linear GD00Z-4 into my ST hub. The Linear GD00Z-4 is sitting next to my hub, so it is not the distance issue. The mobile app just spinning and spinning and saying I’m looking for Things. Any suggestion? From the Manual, it said press the LINK button, maybe this is a dumb question, how long I have to press it?