diff --git a/api/src/certification/configuration/domain/usecases/import-sco-whitelist.js b/api/src/certification/configuration/domain/usecases/import-sco-whitelist.js
index 22a8ecf1ecb..f948b95b37c 100644
--- a/api/src/certification/configuration/domain/usecases/import-sco-whitelist.js
+++ b/api/src/certification/configuration/domain/usecases/import-sco-whitelist.js
@@ -11,6 +11,10 @@ export const importScoWhitelist = withTransaction(
    */
   async ({ externalIds = [], centerRepository }) => {
     await centerRepository.resetWhitelist();
-    return centerRepository.addToWhitelistByExternalIds({ externalIds });
+    const numberOfUpdatedLines = await centerRepository.addToWhitelistByExternalIds({ externalIds });
+
+    if (externalIds.length !== numberOfUpdatedLines) {
+      throw new RangeError('Some externalIds are not valid, please verify whitelist');
+    }
   },
 );
diff --git a/api/src/certification/configuration/infrastructure/repositories/center-repository.js b/api/src/certification/configuration/infrastructure/repositories/center-repository.js
index a9dd545a1f1..57441af7c76 100644
--- a/api/src/certification/configuration/infrastructure/repositories/center-repository.js
+++ b/api/src/certification/configuration/infrastructure/repositories/center-repository.js
@@ -5,14 +5,16 @@ import { CenterTypes } from '../../domain/models/CenterTypes.js';
 /**
  * @param {Object} params
  * @param {Array<number>} params.externalIds
- * @returns {Promise<void>}
+ * @returns {Promise<number>} - number of rows affected
  */
 export const addToWhitelistByExternalIds = async ({ externalIds }) => {
   const knexConn = DomainTransaction.getConnection();
-  return knexConn('certification-centers')
+  const numberOfUpdatedLines = knexConn('certification-centers')
     .update({ isScoBlockedAccessWhitelist: true, updatedAt: knexConn.fn.now() })
     .where({ type: CenterTypes.SCO })
     .whereIn('externalId', externalIds);
+
+  return numberOfUpdatedLines || 0;
 };
 
 /**
diff --git a/api/tests/certification/configuration/acceptance/application/sco-whitelist-route_test.js b/api/tests/certification/configuration/acceptance/application/sco-whitelist-route_test.js
index 5e58a922f88..3a40dc32571 100644
--- a/api/tests/certification/configuration/acceptance/application/sco-whitelist-route_test.js
+++ b/api/tests/certification/configuration/acceptance/application/sco-whitelist-route_test.js
@@ -59,6 +59,50 @@ describe('Certification | Configuration | Acceptance | API | sco-whitelist-route
         .pluck('externalId');
       expect(whitelist).to.deep.equal(['ext1', 'ext2']);
     });
+
+    it('should rollback if invalid whitelist given', async function () {
+      // given
+      const thisExternalIdCannotBeWhitelisted = 'NOT_A_SCO_EXTERNAL_ID';
+      const superAdmin = await insertUserWithRoleSuperAdmin();
+      const buffer = `externalId\next1\n${thisExternalIdCannotBeWhitelisted}`;
+      const options = {
+        method: 'POST',
+        url: '/api/admin/sco-whitelist',
+        headers: {
+          authorization: generateValidRequestAuthorizationHeader(superAdmin.id),
+        },
+        payload: buffer,
+      };
+      databaseBuilder.factory.buildCertificationCenter({
+        isV3Pilot: true,
+        type: CERTIFICATION_CENTER_TYPES.SCO,
+        externalId: 'ext1',
+        isScoBlockedAccessWhitelist: false,
+      });
+      databaseBuilder.factory.buildCertificationCenter({
+        isV3Pilot: true,
+        type: CERTIFICATION_CENTER_TYPES.PRO,
+        externalId: thisExternalIdCannotBeWhitelisted,
+        isScoBlockedAccessWhitelist: false,
+      });
+      const whitelistRollbackedToThis = databaseBuilder.factory.buildCertificationCenter({
+        isV3Pilot: true,
+        type: CERTIFICATION_CENTER_TYPES.SCO,
+        externalId: 'ext3',
+        isScoBlockedAccessWhitelist: true,
+      });
+      await databaseBuilder.commit();
+
+      // when
+      const response = await server.inject(options);
+
+      // then
+      expect(response.statusCode).to.equal(500);
+      const whitelist = await knex('certification-centers')
+        .where({ isScoBlockedAccessWhitelist: true })
+        .pluck('externalId');
+      expect(whitelist).to.deep.equal([whitelistRollbackedToThis.externalId]);
+    });
   });
 
   describe('GET /api/admin/sco-whitelist', function () {
diff --git a/api/tests/certification/configuration/integration/infrastructure/repositories/center-repository_test.js b/api/tests/certification/configuration/integration/infrastructure/repositories/center-repository_test.js
index f82554b4828..32bc0f12b12 100644
--- a/api/tests/certification/configuration/integration/infrastructure/repositories/center-repository_test.js
+++ b/api/tests/certification/configuration/integration/infrastructure/repositories/center-repository_test.js
@@ -23,11 +23,12 @@ describe('Certification | Configuration | Integration | Repository | center-repo
       await databaseBuilder.commit();
 
       // when
-      await centerRepository.addToWhitelistByExternalIds({
+      const numberOfUpdatedLines = await centerRepository.addToWhitelistByExternalIds({
         externalIds: [whitelistedExternalId1, whitelistedExternalId2],
       });
 
       // then
+      expect(numberOfUpdatedLines).to.equal(2);
       const updatedCenter1 = await knex('certification-centers').where({ id: center1BeforeUpdate.id }).first();
       expect(updatedCenter1.isScoBlockedAccessWhitelist).to.be.true;
       expect(updatedCenter1.updatedAt).to.be.above(center1BeforeUpdate.updatedAt);
diff --git a/api/tests/certification/configuration/unit/domain/usecases/import-sco-whitelist_test.js b/api/tests/certification/configuration/unit/domain/usecases/import-sco-whitelist_test.js
index 15bb25989e6..3f8c684bf3b 100644
--- a/api/tests/certification/configuration/unit/domain/usecases/import-sco-whitelist_test.js
+++ b/api/tests/certification/configuration/unit/domain/usecases/import-sco-whitelist_test.js
@@ -1,6 +1,6 @@
 import { DomainTransaction } from '../../../../../../lib/infrastructure/DomainTransaction.js';
 import { importScoWhitelist } from '../../../../../../src/certification/configuration/domain/usecases/import-sco-whitelist.js';
-import { expect, sinon } from '../../../../../test-helper.js';
+import { catchErr, expect, sinon } from '../../../../../test-helper.js';
 
 describe('Certification | Configuration | Unit | UseCase | import-sco-whitelist', function () {
   let centerRepository;
@@ -19,7 +19,7 @@ describe('Certification | Configuration | Unit | UseCase | import-sco-whitelist'
   it('should whitelist a center', async function () {
     // given
     centerRepository.resetWhitelist.resolves();
-    centerRepository.addToWhitelistByExternalIds.resolves();
+    centerRepository.addToWhitelistByExternalIds.resolves(1);
 
     // when
     await importScoWhitelist({
@@ -31,4 +31,22 @@ describe('Certification | Configuration | Unit | UseCase | import-sco-whitelist'
     expect(centerRepository.resetWhitelist).to.have.been.calledOnce;
     expect(centerRepository.addToWhitelistByExternalIds).to.have.been.calledOnceWithExactly({ externalIds: [12] });
   });
+
+  it('should reject new whitelist when not valid', async function () {
+    // given
+    centerRepository.resetWhitelist.resolves();
+    centerRepository.addToWhitelistByExternalIds.resolves(1);
+
+    // when
+    const error = await catchErr((externalIds) =>
+      importScoWhitelist({
+        externalIds,
+        centerRepository,
+      }),
+    )([11, 12]);
+
+    // then
+    expect(error).to.be.instanceOf(RangeError);
+    expect(error.message).to.equal('Some externalIds are not valid, please verify whitelist');
+  });
 });