We are not able to use the action create page for Epics in JIRA to create a wiki page in Confluence. This is because the application and display urls differ in the application link.
To reproduce:

• Create an application link between JIRA and Confluence where the display url and application url are different.
• Enter a scrum board and expand the info field of an Epic.
• Click "linked pages" and then the button "Create page".
  Result: A browser tab is opened with an URL which uses the application url to access Confluence. This will not work in our case, because the application url uses localhost.