Fingerprints not being removed when used?

[fairyhousemgmt]

I have "Maximum usages for fingerprint" on 1, so each fingerprint should only be used once.
Requesting a fingerprint from the server works via http://fingerprints.bablosoft.com/prepare?version=5&tags=Windows 10&key= request, but its not showing in dashboard that it used a fingerprint.
And its also not removing it from the server.

What am I doing wrong?
Any help is highly appreciated