We have a Server running Jira Software Version 8.14 and Confluence 7.10. That server is running in subnet X. In a DMZ in subnet Y we have a Server running Jira Service Management 4.14.0 based on Jira Core 8.14.
All instances have application links between each other, so that references should work.


Application Link Status in Service Managment to Jira Software is fine. Connected in Both directions with OAuth Authendication.

In Confluence i am able to Add a jira filter which shows issues form the Jira Software Instance and it also shows Issues from Jira Service Management.
However i am still not able to Link issues of Service Management with Jira Software and the over way round. Only the local project issues of the jira software instance are shown on jira software and only the local project issues of the jira service management instance are shown in service management.
Is there anything i am missing to make linked issues between Jira Software and Jira ServiceManagement working?
I am Administrator in both instances. The same credentials are used on both servers.