When I try to add a JIRA Calendar to My Calendars in Confluence, I only get the Confluence related fields (Name, Description, Related Space), and the "OK" button remains greyed out. This is a big reason we purchased Team Calendars, and it not working is a major frustration. What is the problem?
Have you configured trusted application links between Confluence and JIRA. Are you able to see any project being retrieved from JIRA side when you tried to add the calendar. If there are none, you might want to double check your trusted application links configuration and see if there are any misconfiguration there.
If your username is the same between Confluence and JIRA, you might want to use OAuth method and see how it goes.
Also, check if your "Accept Remote API" is enabled in JIRA "General Configuration". For sanity checked, could you create a JIRA issues macro, if this macro works fine then the issue is not in trusted app configuration.
You could also try to enable plugin safe mode and enable only team calendar and see if it helps.
Hope it helps.
We were experiencing the same problem which turned out to be caused by this issue:
For us, increasing the timeout period solved the problem.
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