diff --git a/lib/tdf3/src/tdf.ts b/lib/tdf3/src/tdf.ts
index 4decf7a9b..9d03f20ed 100644
--- a/lib/tdf3/src/tdf.ts
+++ b/lib/tdf3/src/tdf.ts
@@ -726,8 +726,13 @@ export function splitLookupTableFactory(
   for (const kao of keyAccess) {
     const disjunction = splitPotentials[kao.sid ?? ''];
     if (kao.url in disjunction) {
+      // TODO(DSPX-3454): Handle duplicate KAS URLs with different KIDs.
+      // Each KAO contains a KID - the function should be updated to use this
+      // information to differentiate between keys from the same KAS.
+      // Cross-SDK validation needed via xtest.
       throw new InvalidFileError(
-        `TODO: Fallback to no split ids. Repetition found for [${kao.url}] on split [${kao.sid}]`
+        `Unable to decrypt: Multiple keys detected for Key Access Server [${kao.url}]. ` +
+          `Please contact your administrator.`
       );
     }
     if (allowed(kao)) {
diff --git a/lib/tests/mocha/unit/tdf.spec.ts b/lib/tests/mocha/unit/tdf.spec.ts
index 2e476ac3b..e1642f3c5 100644
--- a/lib/tests/mocha/unit/tdf.spec.ts
+++ b/lib/tests/mocha/unit/tdf.spec.ts
@@ -302,7 +302,7 @@ describe('splitLookupTableFactory', () => {
 
     expect(() => TDF.splitLookupTableFactory(keyAccess, allowedKases)).to.throw(
       InvalidFileError,
-      'TODO: Fallback to no split ids. Repetition found for [https://kas1] on split [split1]'
+      'Unable to decrypt: Multiple keys detected for Key Access Server [https://kas1]. Please contact your administrator.'
     );
   });