diff --git a/tests/integration/multi-instance/multi_instance_test.go b/tests/integration/multi-instance/multi_instance_test.go
index 40c0c90d..15393666 100644
--- a/tests/integration/multi-instance/multi_instance_test.go
+++ b/tests/integration/multi-instance/multi_instance_test.go
@@ -438,6 +438,8 @@ func (e *env) killNine(t *testing.T, inst *instance) {
 // alice 发放激活凭据。凭据兑换后设置 alicePass，然后才能发 API Key。
 func (e *env) loginAlice(t *testing.T) *userClient {
 	t.Helper()
+	// 账户事务会锁库内服务身份；serve 不补写这行，须先显式建立。
+	e.cli(t, "identity", "ensure", "--dsn", e.dbDSN, "--instance-id", "mi-acceptance", "--dbref", "pg")
 	e.cli(t, "user", "bootstrap-admin", "--dsn", e.dbDSN, "--owner", "mi_setup", "--name", "Setup",
 		"--out-file", filepath.Join(t.TempDir(), "setup-grant"))
 	grantFile := filepath.Join(t.TempDir(), "alice-grant")