diff --git a/apps/federatedfilesharing/lib/FederatedShareProvider.php b/apps/federatedfilesharing/lib/FederatedShareProvider.php
index a00148d90670..1c4242b20915 100644
--- a/apps/federatedfilesharing/lib/FederatedShareProvider.php
+++ b/apps/federatedfilesharing/lib/FederatedShareProvider.php
@@ -240,7 +240,7 @@ protected function createFederatedShare(IShare $share) {
 			$ownerAddress = $this->addressHandler->getLocalUserFederatedAddress($owner);
 			$sharedWith = $share->getSharedWith();
 			$shareWithAddress = new Address($sharedWith);
-			$status = $this->notifications->sendRemoteShare(
+			$result = $this->notifications->sendRemoteShare(
 				$shareWithAddress,
 				$ownerAddress,
 				$sharedByAddress,
@@ -252,8 +252,16 @@ protected function createFederatedShare(IShare $share) {
 			/* Check for failure or null return from sending and pick up an error message
 			 * if there is one coming from the remote server, otherwise use a generic one.
 			 */
-			if (!$status || $status['ocs']['meta']['status'] === 'failure') {
-				$msg = $status['ocs']['meta']['message'] ?? false;
+			if (\is_bool($result)) {
+				$status = $result;
+			} elseif (isset($result['ocs']['meta']['status'])) {
+				$status = $result['ocs']['meta']['status'];
+			} else {
+				$status = false;
+			}
+
+			if ($status === false) {
+				$msg = $result['ocs']['meta']['message'] ?? false;
 				if (!$msg) {
 					$message_t = $this->l->t('Sharing %s failed, could not find %s, maybe the server is currently unreachable.',
 						[$share->getNode()->getName(), $share->getSharedWith()]);
diff --git a/changelog/unreleased/37311 b/changelog/unreleased/37311
new file mode 100644
index 000000000000..ed9b6dcb58a6
--- /dev/null
+++ b/changelog/unreleased/37311
@@ -0,0 +1,8 @@
+Bugfix: Rewrite code to fix some notices under PHP 7.4
+
+Fixed "Trying to access array offset on value of type" notices in
+OC\Files\Storage\DAV and OCA\FederatedFileSharing\FederatedShareProvider
+under PHP 7.4.
+
+https://github.com/owncloud/core/pull/37311
+https://github.com/owncloud/core/issues/37303
diff --git a/lib/private/Files/Storage/DAV.php b/lib/private/Files/Storage/DAV.php
index 61650b5cc0d2..cda3759626c5 100644
--- a/lib/private/Files/Storage/DAV.php
+++ b/lib/private/Files/Storage/DAV.php
@@ -684,7 +684,7 @@ private function simpleResponse($method, $path, $body, $expected) {
 			// client request is in \OC\HTTP\Client
 			/* @phan-suppress-next-line PhanUndeclaredMethod */
 			$response = $this->client->request($method, $this->encodePath($path), $body);
-			return $response['statusCode'] == $expected;
+			return isset($response['statusCode']) && $response['statusCode'] == $expected;
 		} catch (ClientHttpException $e) {
 			if ($e->getHttpStatus() === Http::STATUS_NOT_FOUND && $method === 'DELETE') {
 				$this->statCache->clear($path . '/');