Most of the older Google Fit modules broke when Google changed their API and authentication rules a few years back. MMM-GoogleFit (by amcolash) used to be the gold standard, and while it’s technically ‘archived,’ some people have had luck getting it to work by manually updating the dependencies. If you’re okay with a bit of a workaround, a lot of us have switched to using MMM-Withings if you have their scale/watch, or even MMM-Strava for activity tracking, as those seem to be better maintained lately!