diff --git a/apps/api/app/services/checkin_scheduler.ts b/apps/api/app/services/checkin_scheduler.ts
index d29694f..46f9248 100644
--- a/apps/api/app/services/checkin_scheduler.ts
+++ b/apps/api/app/services/checkin_scheduler.ts
@@ -33,7 +33,7 @@ export async function scheduleCheckinForInvoice(
     .where('status', 'scheduled')
   const queue = getQueue(CHECKIN_QUEUE)
   for (const t of existing) {
-    await queue.remove(`checkin:${t.id}`).catch(() => {})
+    await queue.remove(`checkin-${t.id}`).catch(() => {})
     t.useTransaction(trx ?? (null as never))
     t.status = 'expired'
     await t.save()
@@ -65,7 +65,7 @@ export async function scheduleCheckinForInvoice(
     { taskId: task.id, plain },
     {
       delay,
-      jobId: `checkin:${task.id}`,
+      jobId: `checkin-${task.id}`,
       attempts: 3,
       backoff: { type: 'exponential', delay: 30_000 },
     }
@@ -88,7 +88,7 @@ export async function cancelCheckinForInvoice(
 
   const queue = getQueue(CHECKIN_QUEUE)
   for (const t of tasks) {
-    await queue.remove(`checkin:${t.id}`).catch(() => {})
+    await queue.remove(`checkin-${t.id}`).catch(() => {})
     t.useTransaction(trx ?? (null as never))
     t.status = 'expired'
     await t.save()
diff --git a/apps/api/app/services/relance_scheduler.ts b/apps/api/app/services/relance_scheduler.ts
index 4579719..9b528b1 100644
--- a/apps/api/app/services/relance_scheduler.ts
+++ b/apps/api/app/services/relance_scheduler.ts
@@ -79,7 +79,8 @@ export async function scheduleRelancesForInvoice(
       {
         delay,
         // Idempotency : un seul job actif par task.
-        jobId: `relance:${task.id}`,
+        // BullMQ 5+ interdit `:` dans les custom jobIds → tiret.
+        jobId: `relance-${task.id}`,
         // Retry exponentiel — si Mailpit est down, BullMQ retry 5x avec
         // backoff (cf. backend.md §13.2).
         attempts: 5,