diff --git a/server/routes/businesses.js b/server/routes/businesses.js
index 126b193..c46fe2e 100644
--- a/server/routes/businesses.js
+++ b/server/routes/businesses.js
@@ -70,11 +70,36 @@ async function findBusinessByApplicationId(merchantId, applicationId) {
   if (!normalizedApplicationId) return null;
 
   const businesses = await getIndex(merchantId);
-  return businesses.find((business) => {
+  const exactMatch = businesses.find((business) => {
     const storedApplicationId = normalizeScopeId(business.applicationId);
     const storedBusinessId = normalizeScopeId(business.businessId);
     return storedApplicationId === normalizedApplicationId || storedBusinessId === normalizedApplicationId;
-  }) || null;
+  });
+
+  if (exactMatch) return exactMatch;
+
+  const normalizedBrandLookup = normalizedApplicationId.toLowerCase();
+  const brandMatches = businesses.filter((business) => normalizeText(business.brandName).toLowerCase() === normalizedBrandLookup);
+
+  if (brandMatches.length > 1) {
+    throw createHttpError(
+      409,
+      'Multiple businesses matched the provided applicationId brand fallback',
+      {
+        code: 'AMBIGUOUS_BUSINESS_MATCH',
+        details: {
+          companyId: merchantId,
+          applicationId: normalizedApplicationId,
+          matchedBusinesses: brandMatches.map((business) => ({
+            businessId: business.businessId,
+            brandName: business.brandName,
+          })),
+        },
+      }
+    );
+  }
+
+  return brandMatches[0] || null;
 }
 
 const PROVIDER_FIELDS = ['providerName', 'senderId', 'dltEntityId', 'authKey'];