fix: don't default authSetting to ServerDefault in bulk user add (#1779)

* fix: don't default authSetting to ServerDefault in bulk user add

ServerDefault is wrong for Tableau Cloud. Match the single-user add/update
behaviour and only send authSetting when explicitly set.

Fixes #1777

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* fix: update test to match corrected bulk add authSetting behaviour

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: jacalata

tableauserverclient/server/request_factory.py

@@ -1005,8 +1005,8 @@ def import_from_csv_req(self, csv_content: bytes, users: Iterable[UserItem]):
                 raise ValueError("User cannot have both authSetting and idpConfigurationId.")
             elif user.idp_configuration_id is not None:
                 user_element.attrib["idpConfigurationId"] = user.idp_configuration_id
-            else:
-                user_element.attrib["authSetting"] = user.auth_setting or "ServerDefault"
+            elif user.auth_setting is not None:
+                user_element.attrib["authSetting"] = user.auth_setting
 
         parts = {
             "tableau_user_import": ("tsc_users_file.csv", csv_content, "file"),

test/test_user.py

@@ -467,7 +467,7 @@ def test_bulk_add(server: TSC.Server) -> None:
         for user, xml_user in zip(users, xml_users):
             assert user.name == xml_user.get("name")
             if user.idp_configuration_id is None:
-                assert xml_user.get("authSetting") == (user.auth_setting or "ServerDefault")
+                assert xml_user.get("authSetting") == user.auth_setting
             else:
                 assert xml_user.get("idpConfigurationId") == user.idp_configuration_id
                 assert xml_user.get("authSetting") is None