I installed DQS after MDS on one server.
The login domain\MDS_ServiceAccounts was created and a corresponding users called MDS_ServiceAccounts were assigned to that login in all 3 DQS databases. The DQS_Main role dqs_administrator has the user MDS_ServiceAccounts as a member. DQS databases are right next to the MDS db on the same server.
In the MDS Configuration Manager, under Web Configuration, clicking "Enable integration with Data Quality Services" results in the message "Successfully integrated with Data Quality Services."
In Excel (on 2 different machines) the Add-in is installed. I created a connection, connected and saw my model.
The DQS options are not available.
It's a fairly complicated recipe, but each step is straightforward. What have I missed?