My service desk customers connected to public Confluence KB consume Confluence licence

[Kemal Bajramovic]

I have a problem with service desk customers consuming Confluence licence. This is a set-up:

1. I have a Service Desk add-on (v.2.5.9) on JIRA Server (v.6.4.12) and Confluence Server (v.5.7.1) using JIRA Server user directory.
2. I have a service desk project connected to a public Confluence knowledge base (http://tim.ads.gov.ba/x/LoCW) with anonymous access allowed and service desk customers self-registration.

Problem:

When a service desk customer register at the Customer portal, it's automatically added as a Confluence user consuming a licence. This user can't log-in to Confluence receiving a message (Not Permitted - You are not permitted to perform this operation.) but nevertheless I loose a licence which eventually leads legitimate users to not being able to create new articles in Confluence.

[Max Romer]

I have this exact same problem as well. Any new service desk user invited consumes a confluence license when I use the JIRA directory for the user base in confluence.