I just re-set up the CO2 Signal integration through the Energy Dashboard config page.
Now when I view my Energy Dashboard I see a message
Entity not available: sensor.co2_signal_grid_fossil_fuel_percentage
The CO2 Signal process from the Energy dashboard settings page now adds the Energy Maps integration, and it now uses a different name for the sensor than before.
sensor.electricity_maps_grid_fossil_fuel_percentage
How can I get this entity into my Energy dashboard?