Well. Have you checked if there have been other discussions on this subject?
Have you considered giving us ANY useful information?
Like, what OS are you on? Which app are you trying to use? Subsurface-mobile 3.2.1 on iOS? Subsurface 5.0.3 on Ubuntu Linux?
How are you connecting the watch (ok, that second message from you at least contains an error message and from that I know that you tried to connect via USB)?
Things like this.
I get really tired of "guess the problem" games.
And I find it exhausting to answer the same questions and write the same suggestions over and over again.
/D