diff --git a/src/pages/ReimbursementAccount/NonUSD/utils/getSignerDetailsAndSignerFilesForSignerInfo.ts b/src/pages/ReimbursementAccount/NonUSD/utils/getSignerDetailsAndSignerFilesForSignerInfo.ts
index 55f2db9f784cd..db08a66bf270c 100644
--- a/src/pages/ReimbursementAccount/NonUSD/utils/getSignerDetailsAndSignerFilesForSignerInfo.ts
+++ b/src/pages/ReimbursementAccount/NonUSD/utils/getSignerDetailsAndSignerFilesForSignerInfo.ts
@@ -22,6 +22,10 @@ const signerDetailsFields = [FULL_NAME, EMAIL, JOB_TITLE, DATE_OF_BIRTH, STREET,
 const signerFilesFields = [PROOF_OF_DIRECTORS, ADDRESS_PROOF, COPY_OF_ID, CODICE_FISCALE];
 const beneficialOwnerFields = [FIRST_NAME, LAST_NAME, DOB, BENEFICIAL_STREET, BENEFICIAL_CITY, BENEFICIAL_STATE, BENEFICIAL_ZIP_CODE];
 
+// These fields are required by the backend and must always be included in the request
+// so that proper validation errors can be returned if they're missing
+const requiredSignerFields = new Set<string>([FULL_NAME, DATE_OF_BIRTH, JOB_TITLE]);
+
 function getSignerDetailsAndSignerFilesForSignerInfo(reimbursementAccountDraft: OnyxEntry<ReimbursementAccountForm>, signerEmail: string, isUserBeneficialOwner: boolean) {
     const signerDetails: Record<string, string | boolean | FileObject[]> = {};
     const signerFiles: Record<string, string | FileObject | boolean> = {};
@@ -32,18 +36,28 @@ function getSignerDetailsAndSignerFilesForSignerInfo(reimbursementAccountDraft:
             continue;
         }
 
-        if (!reimbursementAccountDraft?.[fieldName]) {
+        if (fieldName === STREET || fieldName === CITY || fieldName === STATE || fieldName === ZIP_CODE) {
+            if (reimbursementAccountDraft?.[fieldName]) {
+                signerDetails[ADDRESS] = signerDetails[ADDRESS]
+                    ? `${SafeString(signerDetails[ADDRESS])}, ${SafeString(reimbursementAccountDraft?.[fieldName])}`
+                    : SafeString(reimbursementAccountDraft?.[fieldName]);
+            }
             continue;
         }
 
-        if (fieldName === STREET || fieldName === CITY || fieldName === STATE || fieldName === ZIP_CODE) {
-            signerDetails[ADDRESS] = signerDetails[ADDRESS]
-                ? `${SafeString(signerDetails[ADDRESS])}, ${SafeString(reimbursementAccountDraft?.[fieldName])}`
-                : reimbursementAccountDraft?.[fieldName];
+        // Preserve type for DOWNLOADED_PDS_AND_FSG since they are boolean values
+        if (fieldName === DOWNLOADED_PDS_AND_FSG) {
+            if (reimbursementAccountDraft?.[fieldName]) {
+                signerDetails[fieldName] = reimbursementAccountDraft[fieldName];
+            }
             continue;
         }
 
-        signerDetails[fieldName] = reimbursementAccountDraft?.[fieldName];
+        // Always include required fields (with empty string if not present) so Auth validation can catch them
+        // For non-required fields, only include if they have a value
+        if (requiredSignerFields.has(fieldName) || reimbursementAccountDraft?.[fieldName]) {
+            signerDetails[fieldName] = SafeString(reimbursementAccountDraft?.[fieldName]);
+        }
     }
 
     if (isUserBeneficialOwner) {