If you are unable to build or AI is unable to build you haven't set something up correctly. Most likely you haven't used the right objects.
you need:
"starting_territory_team"
"starting_position_shared_territory"
"map_entry_point"
You need 1 of each of those objects for each player on your map, make sure you are assigning each group of those objects to the same player assignment. And make sure you are actually assigning current selected, not default.
Don't forget to check and fix any issues with territory (Voronoi) after editing.
Finally don't forget to save and repackage!
Follow OnkelSam's video guide exactly and you'll get it right.
Hope that helps!
helpful tip: use the "Player ownership coloring" button to toggle colors for player assignment for easy checking/debugging. The button is the 7th button from the right on the toolbar.
that didn't work it gave a error with "this map contains a odd number of players". every player has its map_entry_point, starting_position_shared_territory and starting_territory_team point. but in the first place i had one starting_territory_team (owner:world) per 2 friendly's next to each other that worked without problem.
thank you it worked for some reason it switched the player assigments back to world.
but after some trying it finnaly worked so thx for the help everyone.