Some characters requests resulting in 404

My application works mostly fine, but for some characters it would not allow for any calls.
An example is this one:
region: eu
realm: defias-brotherhood
name: kolzii

It works neither in my app, nor in the Profile API testing box resulting in error 404.

Any ideas whether I’m doing something wrong, or there is an issue with the API?

Most likely the owner of this account disabled the option to share data with 3rd party apps ( privacy option).

Another possibility is the character hasn’t been played in a long time and there is no API data available.

I’d say the owner disabled data sharing then, as in the WoW Armory there’s no inactivity notice visible. Thank you for your help Schiller!