Please verify that you installed the companion app of the watch face, as suggested in the watch face settings on your watch.
Then, in the mobile application, verify that the connection is done with Google Fit. There is a “connect/disconnect” button, which will be updated, depending on the connection status.
Just check if the button ask you to connect (meaning you are not already connected), or to disconnect (meaning you are connected and ready to go).
You can try to open Google Fit on your mobile device, and see if the steps are correctly displayed / if there are no pending “settings” screens to validate.
Alternatively, you can use any steps count external complication data (Strava, Google Fit…), to be displayed as a complication on any of the widget.
Just select the steps in the complication chooser helper.