I have been reviewing the A220 recently for some operations in Airline Generations, currently, I think the range is shorter than the actual jet can do. When comparing this to the latest information from Airbus it looks like it has had a further MTOW increase to improve range.
https://aircraft.airbus.com/en/aircraft/a220/a220-100 (https://aircraft.airbus.com/en/aircraft/a220/a220-100)
https://aircraft.airbus.com/en/aircraft/a220/a220-300 (https://aircraft.airbus.com/en/aircraft/a220/a220-300)