It is not uncommon that airlines limit the crosswind under which first officers can land. When they have flown for a certain amount of hours on the type or say a year after completing of the route training these limits can be lifted. However, these measures will vary for each individual airline.
Training crosswind landings on a simulator (even a level D) is not an accurate representation of the real world. This is due to the difficulty in modelling gust magnitude, duration, frequency, and direction in simulators. In reality the wind will also act on the different aircraft components separately e.g. on the fuselage, landing gear, tail section, engine nacelles etc. In the simulator these local effects are not taken into account. During the ground roll simulators are even less perfect. The quality of the mathematical ground model in combination with the motion and visual ques of a simulator is usually not high enough to allow sufficient confidence for use of training crosswind roll outs under slippery conditions. These limitations are often not fully recognised by the instructors and even the suppliers of these simulators.
Although simulators are excellent training tools there are some things that you need a real aircraft for.