Why can't I add an Epic to my Issue using the Epic Link?

[Michelle Mundy]

I converted my next-gen project to a Classic project by moving all issues to a new project. When I did this, I lost all Epic to Task/Story connections. I'm trying to reconnect the Epics to the appropriate Task/Story, but the Epic Link field only populates a few Epics. See screenshot below.

When I do select one of the available Epics that does populate, the connection doesn't appear to work. See below.

Is this a bug? Is there any known workaround for this? 

[Bill Sheboy]

Hi @Michelle Mundy 

I did not see any open defects for this symptom in the public backlog, so I suggest that you submit a support ticket for it.  You should be able to do that as the site admin.

https://support.atlassian.com/contact/#/

Once you hear back from support, please post back here what you learn.  Thanks!

Best regards,

Bill