As long as your telco provides SMS services overseas, you should not have any issue receiving your OTP overseas.
If you did not receive your OTP via SMS, you can use Authy to generate an alternate OTP. Authy is an authentication app to generate an OTP and it works offline.
Click here to find out how you can download Authy app for iPhone, iPad, Android, or Windows.
If you face any issues, please reach out to our Customer Experience Team at firstname.lastname@example.org or +65 69097100 and we will be happy to help.
Our hotline hours are from Mondays to Fridays 9:00 AM to 6:00 PM SGT (excluding weekends and public holidays).