Pro 2.3 and Windows 10
I have been having trouble with relates where it worked in some projects but not others. After trying various options think I have found the source of the problem.
I have a landuse feature class which I use in my relate. However if I include layers files that reference the same feature class within my Contents pane, then the relate fails and displays one of the layer files in the relate table heading but with no data. If I remove these layer files then the relate works.