diff --git a/apps/bff/src/vendors/freebit/freebit.service.ts b/apps/bff/src/vendors/freebit/freebit.service.ts
index c85f801b..a69e8fbc 100644
--- a/apps/bff/src/vendors/freebit/freebit.service.ts
+++ b/apps/bff/src/vendors/freebit/freebit.service.ts
@@ -580,16 +580,67 @@ export class FreebititService {
    */
   async reissueEsimProfile(account: string): Promise<void> {
     try {
-      const request: Omit<FreebititEsimReissueRequest, 'authKey'> = { account };
+      // Use PA05-41 eSIM Account Activation API (addAcct) for reissue
+      const authKey = await this.getAuthKey();
 
-      await this.makeAuthenticatedRequest<FreebititEsimReissueResponse>(
-        '/esim/reissueProfile/',
-        request
-      );
+      // Fetch details to get current EID and plan/network where available
+      const details = await this.getSimDetails(account);
+      if (details.simType !== 'esim') {
+        throw new BadRequestException('This operation is only available for eSIM subscriptions');
+      }
 
-      this.logger.log(`Successfully reissued eSIM profile for account ${account}`, { account });
+      if (!details.eid) {
+        throw new BadRequestException('eSIM EID not found for this account');
+      }
+
+      const payload: import('./interfaces/freebit.types').FreebititEsimAccountActivationRequest = {
+        authKey,
+        aladinOperated: '20',
+        createType: 'reissue',
+        eid: details.eid, // existing EID used for reissue
+        account,
+        simkind: 'esim',
+        addKind: 'R',
+        // Optional enrichments omitted to minimize validation mismatches
+      };
+
+      const url = `${this.config.baseUrl}/mvno/esim/addAcct/`;
+      const response = await fetch(url, {
+        method: 'POST',
+        headers: {
+          'Content-Type': 'application/json; charset=utf-8',
+        },
+        body: JSON.stringify(payload),
+      });
+
+      if (!response.ok) {
+        const text = await response.text().catch(() => '');
+        this.logger.error('Freebit PA05-41 HTTP error', { url, status: response.status, statusText: response.statusText, body: text?.slice(0, 500) });
+        throw new InternalServerErrorException(`HTTP ${response.status}: ${response.statusText}`);
+      }
+
+      const data = await response.json() as import('./interfaces/freebit.types').FreebititEsimAccountActivationResponse;
+      const rc = typeof data.resultCode === 'number' ? String(data.resultCode) : (data.resultCode || '');
+      if (rc !== '100') {
+        const message = data.message || 'Unknown error';
+        this.logger.error('Freebit PA05-41 API error response', {
+          endpoint: '/mvno/esim/addAcct/',
+          resultCode: data.resultCode,
+          statusCode: data.statusCode,
+          message,
+        });
+        throw new FreebititErrorImpl(
+          `API Error: ${message}`,
+          rc || '0',
+          data.statusCode || '0',
+          message
+        );
+      }
+
+      this.logger.log(`Successfully reissued eSIM profile via PA05-41 for account ${account}`, { account });
     } catch (error: any) {
-      this.logger.error(`Failed to reissue eSIM profile for account ${account}`, { 
+      if (error instanceof BadRequestException) throw error;
+      this.logger.error(`Failed to reissue eSIM profile via PA05-41 for account ${account}`, { 
         error: error.message,
         account,
       });
diff --git a/apps/bff/src/vendors/freebit/interfaces/freebit.types.ts b/apps/bff/src/vendors/freebit/interfaces/freebit.types.ts
index a06f386a..1dc1052d 100644
--- a/apps/bff/src/vendors/freebit/interfaces/freebit.types.ts
+++ b/apps/bff/src/vendors/freebit/interfaces/freebit.types.ts
@@ -230,6 +230,45 @@ export interface FreebititEsimAddAccountResponse {
   };
 }
 
+// PA05-41 eSIM Account Activation (addAcct)
+export interface FreebititEsimAccountActivationRequest {
+  authKey: string;
+  aladinOperated: string; // '10' issue, '20' no-issue
+  masterAccount?: string;
+  masterPassword?: string;
+  createType: 'new' | 'reissue' | 'exchange' | string;
+  eid?: string; // required for reissue/exchange per business rules
+  account: string; // MSISDN
+  simkind: 'esim' | string;
+  repAccount?: string;
+  size?: string;
+  addKind?: 'N' | 'R' | string; // e.g., 'R' for reissue
+  oldEid?: string;
+  oldProductNumber?: string;
+  mnp?: {
+    reserveNumber: string;
+    reserveExpireDate: string; // YYYYMMDD
+  };
+  firstnameKanji?: string;
+  lastnameKanji?: string;
+  firstnameZenKana?: string;
+  lastnameZenKana?: string;
+  gender?: string; // 'M' | 'F' | etc
+  birthday?: string; // YYYYMMDD
+  shipDate?: string; // YYYYMMDD
+  planCode?: string;
+  deliveryCode?: string;
+  globalIp?: string; // '10' none, '20' with global IP (env-specific mapping)
+  contractLine?: string; // '4G' | '5G'
+}
+
+export interface FreebititEsimAccountActivationResponse {
+  resultCode: number | string;
+  status?: any;
+  statusCode?: string;
+  message?: string;
+}
+
 // Portal-specific types for SIM management
 export interface SimDetails {
   account: string;