I still cannot use the Event Certificate from the Black Spirit Race Event. It states that they cannot be used after the 07 April 2020. Anyone else still have this problem?

I have the same problem.
please fix it

I think the way they fixed it is by replacing our event certificates through mail. the ones we previously have are now useless in exchanging. but it's worth a good amount of silver tho.

i have the same problem with regards in certificate, i already have 42 certificate but the game only read 18. im waiting for this day because i think after the maintenance the issue will be fixed, but still  the same. i hope that this issue/bug will be resolved before the event finished so we can utilized the certificate and enjoy the rewards.