We are experiencing the same issue. 10.3 and 10.4 connect to the databases fine, but in testing 10.5 we get the insufficient permissions errors. Connecting via the schema owner does not yield these errors, presumably because the schema owner has the select any table privilege granted to it. We are digging to find a proper role/privilege configuration that will stop this, we obviously do not want to grant the select any table privilege to all users.
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