This is a problem partially with a 3d party sync tool. But the problem seems to be in difference in GW user settings somehow.

The tool reports error: "user not on post office" on all users, except ones with special characters in name. like
The difference we see is that theese users are created using"Internet adressing override".

But if we setup a new user using"Internet adressing override" it still generates the same error on this new user.
So something else must be different, we cant figure out what.

tnx in advance