For the EnvironmentId please use any non-empty value, for instance DummyValue as shown below
<add value="DummyValue" key="EnvironmentId" />
That ID is used for Application Insights telemetry purposes and if you are dealing with the local development, specifying any value there will not negatively affect your experience.
You can either manually modify the config file you might already have, or you could specify that environment ID inside the F&O's web.config
and then download the configuration file from within F&O, at this time it will have the EnvironmentId key populated with the value specified in the F&O's web.config.
Additionally the process of activating store commerce is still the same as Retail Modern POS you just have to change the device application type as 'Store Commerce'.
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