diff --git a/cli/src/context.rs b/cli/src/context.rs
index 0e16ab01..8425abb4 100644
--- a/cli/src/context.rs
+++ b/cli/src/context.rs
@@ -265,9 +265,22 @@ pub fn gather_post_test_context<U: AsRef<Path>>(
     )?;
 
     if !allow_empty_test_results && file_set_builder.no_files_found() {
-        return Err(anyhow::anyhow!(InterruptingError::new(
-            "No test output files found to upload."
-        )));
+        let searched = junit_path_wrappers
+            .iter()
+            .map(|j| j.junit_path.as_str())
+            .collect::<Vec<_>>()
+            .join(", ");
+        // Both spellings, since clap can't tell which was passed and the GitHub Action passes the alias.
+        return Err(anyhow::anyhow!(InterruptingError::new(format!(
+            "No test results found to upload{}. Failing because --allow-empty-test-results \
+             (or its alias --allow-missing-junit-files) is false; set it to true to continue \
+             without test results.",
+            if searched.is_empty() {
+                String::new()
+            } else {
+                format!(" in: <{searched}>")
+            }
+        ))));
     }
 
     tracing::info!("Total files pack and upload: {}", file_set_builder.count());
diff --git a/cli/tests/upload.rs b/cli/tests/upload.rs
index b2d8ca91..eed94abe 100644
--- a/cli/tests/upload.rs
+++ b/cli/tests/upload.rs
@@ -1475,6 +1475,14 @@ async fn upload_bundle_no_files_allow_missing_junit_files() {
             assert.stderr(predicate_fn.not())
         };
 
+        if matches!(flag, Flag::OffWithEquals | Flag::OffAliasWithEquals) {
+            assert = assert.code(70).stderr(predicate::str::contains(
+                "No test results found to upload in: <./*>. Failing because \
+                 --allow-empty-test-results (or its alias --allow-missing-junit-files) is false; \
+                 set it to true to continue without test results.",
+            ));
+        }
+
         // HINT: View CLI output with `cargo test -- --nocapture`
         println!("{assert}");
     }