I also experienced this before, less than 10 minutes my problem was solved by live support
IIRC, the OTP problem is only effect to Indonesian users, they are fixing the OTP system.
Oh so the OTP problem affects Indonesian users only, I thought it affects all users from all countries. I experienced the same when I created my account and live support helped me to solve it quickly. Perhaps they have to add other option to receive the code when we want to add withdrawal address. An option to get to code by email would be good additional option in case there is an issue with OTP through sms.