diff --git a/lib/Controller/LoginController.php b/lib/Controller/LoginController.php
index 4aff4bd0..8adc1957 100644
--- a/lib/Controller/LoginController.php
+++ b/lib/Controller/LoginController.php
@@ -288,6 +288,11 @@ public function code(string $state = '', string $code = '', string $scope = '',
 		$this->logger->debug('Code login with core: ' . $code . ' and state: ' . $state);
 
 		if ($error !== '') {
+			if (!$this->isMobileDevice()) {
+				$cancelRedirectUrl = $this->config->getSystemValue('user_oidc.cancel_redirect_url', 'https://cloud.telekom-dienste.de/');
+				return new RedirectResponse($cancelRedirectUrl);
+			}
+
 			return new JSONResponse([
 				'error' => $error,
 				'error_description' => $error_description,
@@ -785,4 +790,20 @@ private function toCodeChallenge(string $data): string {
 		$s = str_replace('/', '_', $s); // 63rd char of encoding
 		return $s;
 	}
+
+	private function isMobileDevice(): bool {
+		$mobileKeywords = $this->config->getSystemValue('user_oidc.mobile_keywords', ['Android', 'iPhone', 'iPad', 'iPod', 'Windows Phone', 'Mobile', 'webOS', 'BlackBerry', 'Opera Mini', 'IEMobile']);
+	
+		if (!isset($_SERVER['HTTP_USER_AGENT'])) {
+			return false; // if no user-agent is set, assume desktop
+		}
+	
+		foreach ($mobileKeywords as $keyword) {
+			if (stripos($_SERVER['HTTP_USER_AGENT'], $keyword) !== false) {
+				return true; // device is mobile
+			}
+		}
+
+		return false; // device is desktop
+	}
 }