diff --git a/apps/frontend/src/app/(app)/bloqueio/page.tsx b/apps/frontend/src/app/(app)/bloqueio/page.tsx
index 393b758..9dfd8f9 100644
--- a/apps/frontend/src/app/(app)/bloqueio/page.tsx
+++ b/apps/frontend/src/app/(app)/bloqueio/page.tsx
@@ -95,7 +95,8 @@ function SuppressionContent() {
   });
 
   const remove = useMutation({
-    mutationFn: (id: string) => suppressionService.remove(id),
+    mutationFn: ({ id, removalReason }: { id: string; removalReason: string }) =>
+      suppressionService.remove(id, removalReason),
     onSuccess: () => {
       queryClient.invalidateQueries({ queryKey: ['suppression'] });
       toast({ title: 'Número desbloqueado', variant: 'success' });
@@ -131,7 +132,12 @@ function SuppressionContent() {
             variant="ghost"
             className="text-destructive"
             onClick={() => {
-              if (confirm(`Desbloquear ${r.phoneNormalized}?`)) remove.mutate(r.id);
+              const removalReason = window.prompt(
+                `Motivo para desbloquear ${r.phoneNormalized} (obrigatório):`,
+              );
+              if (removalReason && removalReason.trim().length > 0) {
+                remove.mutate({ id: r.id, removalReason: removalReason.trim() });
+              }
             }}
           >
             <Trash2 className="size-4" />
diff --git a/apps/frontend/src/lib/api-client.ts b/apps/frontend/src/lib/api-client.ts
index 50c7b12..f8062ad 100644
--- a/apps/frontend/src/lib/api-client.ts
+++ b/apps/frontend/src/lib/api-client.ts
@@ -61,7 +61,11 @@ async function request<T>(
   const init: RequestInit = {
     method,
     credentials: 'include',
-    headers: isForm ? undefined : { 'Content-Type': 'application/json' },
+    // Content-Type: application/json sem corpo faz o Fastify rejeitar a
+    // requisição ("Body cannot be empty when content-type is set to
+    // 'application/json'") — só envia o header quando há de fato um corpo
+    // (ex.: POST de ação sem payload, como reset-password/publish/start).
+    headers: isForm || body === undefined ? undefined : { 'Content-Type': 'application/json' },
     body: isForm
       ? (body as FormData)
       : body !== undefined
@@ -119,7 +123,7 @@ export const api = {
     request<T>('GET', path, { params }),
   post: <T>(path: string, body?: unknown) => request<T>('POST', path, { body }),
   patch: <T>(path: string, body?: unknown) => request<T>('PATCH', path, { body }),
-  delete: <T>(path: string) => request<T>('DELETE', path),
+  delete: <T>(path: string, body?: unknown) => request<T>('DELETE', path, { body }),
   upload: <T>(path: string, form: FormData, params?: object) =>
     request<T>('POST', path, { body: form, isForm: true, params }),
   download: (path: string, params?: object) =>
diff --git a/apps/frontend/src/services/suppression.ts b/apps/frontend/src/services/suppression.ts
index b5fb921..7915cb2 100644
--- a/apps/frontend/src/services/suppression.ts
+++ b/apps/frontend/src/services/suppression.ts
@@ -17,5 +17,6 @@ export const suppressionService = {
     form.append('file', file);
     return api.upload<SuppressionImportResult>('/suppression/import', form);
   },
-  remove: (id: string) => api.delete<void>(`/suppression/${id}`),
+  remove: (id: string, removalReason: string) =>
+    api.delete<void>(`/suppression/${id}`, { removalReason }),
 };