In DocuWare.Administration.exe.Settings make sure that this line is complete. There can be multiple entries so make sure the one with the Organization is the first occurrence in the list.
<ConnectionSettings Name="Standard AS" Server="myserver" Port="9000" Organization="XYZ" Local="false" Active="true" System="Central system" />
You will find this file in the DocuWare Client folder under C:\Program Files (x86)\DocuWare
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