diff --git a/src/VCS/Adapter/Git/GitHub.php b/src/VCS/Adapter/Git/GitHub.php
index 608712e0..403e874f 100644
--- a/src/VCS/Adapter/Git/GitHub.php
+++ b/src/VCS/Adapter/Git/GitHub.php
@@ -636,8 +636,10 @@ protected function generateAccessToken(string $privateKey, ?string $appId): void
         $this->jwtToken = $token;
         $response = $this->call(self::METHOD_POST, '/app/installations/' . $this->installationId . '/access_tokens', ['Authorization' => 'Bearer ' . $token]);
         $responseBody = $response['body'] ?? [];
+        $statusCode = $response['headers']['status-code'] ?? 0;
         if (!array_key_exists('token', $responseBody)) {
-            throw new Exception('Failed to retrieve access token from GitHub API.');
+            $safeBody = \is_array($responseBody) ? \json_encode(\array_intersect_key($responseBody, \array_flip(['message', 'documentation_url']))) : '';
+            throw new Exception('Failed to retrieve access token from GitHub API. Status: ' . $statusCode . '. Response: ' . $safeBody);
         }
         $this->accessToken = $responseBody['token'] ?? '';
     }