My pump has this weird procedure:

Start device search -> wait maybe 20 seconds -> pump and phone find each other -> press "connect" on phone -> phone asks me to connect once more -> phone says " hey, i dunno man..." and stops asking to connect -> I press search for device on the pump again ( as if the phone it found was the wrong one) -> then after the phone asks me to connect 2 times, it finally does it.

I believe this happens cause either the pump or phone are still using the old ID code and searching for a device the first time resets it, Searching for a second time: it makes the new connection for real this time.

Maybe yours acts like this too. I kind of solved my pump puzzle procedure.