what we are using in our test suite is similar to the following connection string:
Data Source=\\servername\aaa\bbb\ccc\ddd.add;User ID=adssys;Password=XXX;ServerType=REMOTE;
With this connection string we are performing our schema read tests, and so this works. I tried now with a freshly created user (no permissions changed), and got the same exception as you. I don't know yet if this is fixable or not, and so I would like to kindly ask you to use the adssys user to obtain the schema.
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