diff --git a/backend/routes/ivantiFpWorkflow.js b/backend/routes/ivantiFpWorkflow.js
index 917051c..7726b65 100644
--- a/backend/routes/ivantiFpWorkflow.js
+++ b/backend/routes/ivantiFpWorkflow.js
@@ -858,6 +858,10 @@ function createIvantiFpWorkflowRouter(db, requireAuth) {
             }
 
             const mapUrl = `/client/${encodeURIComponent(clientId)}/workflowBatch/falsePositive/${encodeURIComponent(mapUuid)}/map`;
+
+            // Map endpoint likely expects multipart/form-data like the create endpoint.
+            // Try both: first as JSON POST, fall back to multipart if that fails.
+            let mapResult;
             const mapBody = {
                 subject: 'hostFinding',
                 filterRequest: {
@@ -870,9 +874,16 @@ function createIvantiFpWorkflowRouter(db, requireAuth) {
                 }
             };
 
-            let mapResult;
             try {
+                // Try JSON first
                 mapResult = await ivantiPost(mapUrl, mapBody, apiKey, skipTls);
+
+                // If JSON returns 500/415, retry as multipart form
+                if (mapResult.status === 500 || mapResult.status === 415) {
+                    console.log('[mapFindings] JSON POST returned', mapResult.status, '— retrying as multipart form');
+                    const formFields = [{ name: 'subjectFilterRequest', value: buildSubjectFilterRequest(findingIds) }];
+                    mapResult = await ivantiFormPost(mapUrl, formFields, [], apiKey, skipTls);
+                }
             } catch (networkErr) {
                 logAudit(db, {
                     userId: req.user.id, username: req.user.username,
@@ -886,7 +897,7 @@ function createIvantiFpWorkflowRouter(db, requireAuth) {
             if (mapResult.status !== 200 && mapResult.status !== 201 && mapResult.status !== 202) {
                 console.error('[mapFindings] Ivanti map failed — status:', mapResult.status, 'body:', (mapResult.body || '').substring(0, 500));
                 console.error('[mapFindings] Request URL:', mapUrl);
-                console.error('[mapFindings] Request body:', JSON.stringify(mapBody));
+                console.error('[mapFindings] Last attempt body/fields — JSON:', JSON.stringify(mapBody).substring(0, 300));
                 const errorMap = {
                     401: 'Ivanti API key is invalid or missing. Contact your administrator.',
                     419: 'API key lacks permissions for this operation.',