diff --git a/src/app/api/volunteer/details/route.ts b/src/app/api/volunteer/details/route.ts
index 0041664..8f883d6 100644
--- a/src/app/api/volunteer/details/route.ts
+++ b/src/app/api/volunteer/details/route.ts
@@ -7,13 +7,13 @@ import {
   SHEET_COLUMNS,
   SHEET_TAB,
 } from "@/app/toronto/volunteer/build-the-vote";
+import { identifyToCustomerio } from "@/lib/customerio";
 import { upsertSheetRow } from "@/lib/google-sheet";
 
 // Build the Vote step 2: optional details, added to the volunteer's row in the
 // Sheet shared with CJPAC. The row is found by the email step 1's response put
-// in an httpOnly cookie, so the email is never in a URL or the page. These
-// answers (including a mayoral preference) go to the Sheet only, not to
-// Customer.io.
+// in an httpOnly cookie, so the email is never in a URL or the page. The
+// answers also go to Customer.io, best-effort as in step 1.
 
 export async function POST(req: NextRequest) {
   try {
@@ -41,6 +41,16 @@ export async function POST(req: NextRequest) {
       },
     });
 
+    try {
+      await identifyToCustomerio(email, {
+        toronto_2026_build_the_vote_availability: availability.join(", "),
+        toronto_2026_build_the_vote_mayoral_candidate: mayoral,
+        toronto_2026_build_the_vote_issues: issues,
+      });
+    } catch (err) {
+      console.error(err);
+    }
+
     return NextResponse.json({ success: true });
   } catch (err) {
     console.error(err);
diff --git a/src/app/api/volunteer/route.ts b/src/app/api/volunteer/route.ts
index 760243f..8e173a7 100644
--- a/src/app/api/volunteer/route.ts
+++ b/src/app/api/volunteer/route.ts
@@ -16,8 +16,7 @@ import { sheetTimestamp, upsertSheetRow } from "@/lib/google-sheet";
 // aren't newsletter subscribers created by our newsletter form.
 //
 // The Sheet write must succeed, or the volunteer is told to try again: a
-// sign-up CJPAC never sees is lost. Customer.io is best-effort. The phone
-// number goes to the Sheet only; CJPAC calls, we don't.
+// sign-up CJPAC never sees is lost. Customer.io is best-effort.
 
 const EMAIL_PATTERN = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
 
@@ -71,9 +70,14 @@ export async function POST(req: NextRequest) {
         first_name: firstName,
         last_name: lastName,
         name: `${firstName} ${lastName}`,
+        phone,
         city,
         postal_code: postalCode,
         toronto_2026_build_the_vote_volunteer: true,
+        toronto_2026_build_the_vote_consent_to_share_with_cjpac: true,
+        toronto_2026_build_the_vote_utm_source: str(body.utm_source, 100),
+        toronto_2026_build_the_vote_utm_medium: str(body.utm_medium, 100),
+        toronto_2026_build_the_vote_utm_campaign: str(body.utm_campaign, 100),
         // A Unix timestamp, so date-based segments can use it.
         toronto_2026_build_the_vote_signed_up_at: Math.floor(Date.now() / 1000),
       });