No Health store on this device
Soma's numbers come from Apple Health on your iPhone. A Mac has none to read.
If Today says No Health store here, Soma can't find Apple Health on this device, so every reading shows a dash.
What to do
Soma is built for iPhone. Install it there, give it Health access and wear your watch or ring as usual. Your numbers live in Apple Health on your iPhone.
On a Mac there's no Apple Health for Soma to read, so there's nothing to fix. The Health access page in Settings says Not on this device too.
Didn't find what you need? Email quentin@somalabs.me with a screenshot, or search all of Help.