For several reasons it is not possible to evaluate support reactions with the trafic loader. Simply replace rigit support by supporting spring elements. It is possible to evaluate the reations of support springs. Further on I recommend to use additional result sets (RSET) to get the corresponding results for a group of springs representing the pier support.
Please have a look inside our online bridge training video.
For modelling the springs: https://info2.sofistik.de/en-bridge-design-training/##03
for modelling the result sets: https://info2.sofistik.de/en-bridge-design-training/##07
This will help you further on.