If your car was built and registered before 2017, it is likely that your air conditioning system needs R134a refrigerant gas. All cars built after 2017 will need 1234yf refrigerant gas.
Some cars built and registered before 2017 were fitted with 1234yf refrigerant. Certain manufacturers adopted this before it became a requirement because of its environmental benefit. R134a refrigerant gas is not very reactive and can take over a decade to break down in the atmosphere. 1234yf is much more reactive and tends to break down in a couple of weeks.
Your air con system must use the type of refrigerant gas recommended by your manufacturer. It is actually illegal to convert an R134a system to run on 1234yf refrigerant gas, even though it is better for the environment.