Hello,
This is unexpected and this has never been reported.
I would first recommend to check for a plugin conflict. There’s probably something on your site, like a plugin, conflicting with WPCA, which could prevent this box to be displayed.
You should normally see an assignment box to let you assign owners, like shown on this documentation.
Also, you could maybe click the “screen options” located at the top right corner of a post edit screen. It basically allows you to select which boxes should be displayed. For some reason, you’ll probably find the “Assignment” box from WPCA unchecked.
I hope that helps.
Regards.
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