Trying to activate a user in crucible, we've got plenty of license headroom to do so, gives me these 3 errors when I try to click the checkbox and save:
This user's details are held externally, so the email address and display name cannot be edited in FishEye and Crucible.
A display name is required.
Not a valid email address.
Of course the user is held in Jira, and crowd authenticated to fisheye/crucible, so there is a valid email & display name. This user has been an active crucible user in the past as well.
As the Crucible user option is present only in Crucible I think it should be possible to edit it even the user being handled externally, so I've raised https://jira.atlassian.com/browse/CRUC-7063for it. Please consider applying the workaround suggested in the bug report.
Please allow me also to add I observed this only with version 3.6.x. In version 3.5.x it is working fine.