I have three IBS-TH1 Plus (v1.5) sensors and none of them appear when using the app to add them as external sensors to the IBS-M2 (MM v2.1.8 &MCU v1.0.0). It just searches for 60 secs and nothing shows up.
Tried power up M2, connect via App, power up TH1, place by M2, connect to M2 via app, press +, search appears but nothing seen.