We have started a region and had plans to build specific City Hall modules in our respective cities, so that the benefits would share between our cities. The same goes for things like Fire Trucks and Police Cars and the like.
None of our upgrades seem to "register" with other cities, and there doesn't appear to be any options for this. I'm assuming it's done automatically. We thought it had to do with the server issues, but the problem has been happening for over 24 hours, and other parts of the game seem to update fine (When we visit each other's cities, progress is up to date. We can actually see the City Hall modules that we're supposed to be sharing!).
Any advice on this issue would be greatly appreciated. We have no idea if we're doing something wrong or otherwise.
Best Answer
It may still be a server issue, even my private game with no external players is not syncing instantly like it should. Townhall addons when placed apply to the region automatically same goes for the HQ for specializations (usually), there is nothing more that you need to do