Trying to control inReach Messenger Plus from D2 Mach 1

When trying to control Messenger Plus from D2 Mach 1 the app on the watch tries to read messages from inReach and fails - just freezes trying to read them. Sending a message is possible only after they are read, hence neither sending nor receiving from the watches is not possible. 
Both devices are pairs and the watch recognises the Messenger. 
Does anyone have a solution?