I dropped a feedback to ABT mobile section, they clarified that they need time to update their system during the trial period.
What happens is that once your virtual cards are registered, they will need to input into the system which in terms spread to bus/mrt. both are running differently to cepas cards.
so only after 7 working days, then can successfully use the virtual cards on mrt/bus. some people can use on mrt but not buses yet cos of this.
also regarding samsung pay, though i know this is an apple forum, will also be able to add into the wallet only after 7 working days.
For apple pay, there is no express transit like suica until further notice..