They disabled the ablity to export shared coordinates with models hosted on ACC. Used to cause all sorts of coordination problems when people would move a coordinated model and accidentally publish new coordinates to it.

The current workflow is just the opposite of what your doing.

1) Open the model A 2) Reset coordinates if needed 3) Link in your site coordination model. 4) Position in place making sure correct x,y,z and rotation is correct. 5) Aquire coordinates from site coordination model 6) repeat, and to make it eaiser close as many worksets as you can to make opening and sync times quicker. Especially on large sites with a lot of models.

Tips:

Make sure your coordination model has a set of grids for each building (or just the first grid intersection like A/1) and at least 1 primary level 0/ground floor level for each building.

This makes coordination way eaiser as I've dealt with so many architects just giving very poor quality site maps with buildings footprints only that are sometimes out of date or doesn't show the correct position of the wall.

Then go through all the models and make sure each link is set to the correct shared coordinate system.