I was playing on Kursk yesterday as the ost and my ai ally was Wehrmacht. . When we went to place our first buildings his blew up and he just sat there. Not building any units or tier buildings . This went on for 10 mins until I sent team order to defend middle of map . Then it seemed to wake up the ai and get him moving and building .
Same map, different match . Ai ally built units but they were all in home sector . Not capping or harnessing . I think part of the issue is based on what the ai can see of the map , what you or it has revealed determines part of its priorities . The geography and resource placement factors into this I think as well. Sometimes giving the team order works . Of course this does nothing if your opponent is the one not building or attacking .