If you apply with a Dutch passport at the Singapore Police website for a Certificate of Clearance (COC), it’s important to fill out Netherlands by citizenship/nationality instead of Dutch.

In case you select the word “Dutch” you will not be able to finish the application after getting your E-approval from the Singapore police. The reason towards this “hiccup” is that the word Dutch is no longer present in the list of nationalities as maintained by the Singapore Police and therefore cannot be matched as such.