diff --git a/lib/Controller/StorageController.php b/lib/Controller/StorageController.php
index a256913..68d98b3 100644
--- a/lib/Controller/StorageController.php
+++ b/lib/Controller/StorageController.php
@@ -193,8 +193,12 @@ private function validationErrorResponse(array $errors): DataResponse {
 	 */
 	private function resolveUniqueMountPoint(string $mountPoint): string {
 		$existingMountPoints = [];
-		foreach ($this->globalStoragesService->getAllGlobalStorages() as $storage) {
-			$existingMountPoints[strtolower($storage->getMountPoint())] = true;
+		foreach ($this->getGlobalStorages() as $storage) {
+			if (!method_exists($storage, 'getMountPoint')) {
+				continue;
+			}
+
+			$existingMountPoints[strtolower((string) $storage->getMountPoint())] = true;
 		}
 
 		if (!isset($existingMountPoints[strtolower($mountPoint)])) {
@@ -211,6 +215,27 @@ private function resolveUniqueMountPoint(string $mountPoint): string {
 		return $candidateMountPoint;
 	}
 
+	/**
+	 * Get global storages with NC32/NC33 compatibility.
+	 *
+	 * @return array<int, mixed>
+	 */
+	private function getGlobalStorages(): array {
+		if (method_exists($this->globalStoragesService, 'getAllGlobalStorages')) {
+			return $this->globalStoragesService->getAllGlobalStorages();
+		}
+
+		if (method_exists($this->globalStoragesService, 'getAllStorages')) {
+			return $this->globalStoragesService->getAllStorages();
+		}
+
+		if (method_exists($this->globalStoragesService, 'getStorages')) {
+			return $this->globalStoragesService->getStorages();
+		}
+
+		return [];
+	}
+
 	/**
 	 * Validate storage connectivity before persisting config.
 	 */