diff --git a/ui/app/serializers/clients/config.js b/ui/app/serializers/clients/config.js
index 00b84ed2e5..d001b36f1d 100644
--- a/ui/app/serializers/clients/config.js
+++ b/ui/app/serializers/clients/config.js
@@ -5,11 +5,17 @@
 
 import ApplicationSerializer from '../application';
 
-export default ApplicationSerializer.extend({
+export default class ClientsConfigSerializer extends ApplicationSerializer {
+  // these attrs are readOnly
+  attrs = {
+    billingStartTimestamp: { serialize: false },
+    minimumRetentionMonths: { serialize: false },
+    reportingEnabled: { serialize: false },
+  };
+
   normalizeResponse(store, primaryModelClass, payload, id, requestType) {
     if (!payload.data) {
-      // CBS TODO: Remove this if block once API is published
-      return this._super(store, primaryModelClass, payload, id, requestType);
+      return super.normalizeResponse(...arguments);
     }
     const normalizedPayload = {
       id: payload.id,
@@ -18,11 +24,11 @@ export default ApplicationSerializer.extend({
         enabled: payload.data.enabled?.includes('enable') ? 'On' : 'Off',
       },
     };
-    return this._super(store, primaryModelClass, normalizedPayload, id, requestType);
-  },
+    return super.normalizeResponse(store, primaryModelClass, normalizedPayload, id, requestType);
+  }
 
   serialize() {
-    const json = this._super(...arguments);
+    const json = super.serialize(...arguments);
     if (json.enabled === 'On' || json.enabled === 'Off') {
       const oldEnabled = json.enabled;
       json.enabled = oldEnabled === 'On' ? 'enable' : 'disable';
@@ -33,5 +39,5 @@ export default ApplicationSerializer.extend({
     }
     delete json.queries_available;
     return json;
-  },
-});
+  }
+}
diff --git a/ui/tests/integration/components/clients/config-test.js b/ui/tests/integration/components/clients/config-test.js
index 65e8ea3d4c..58aeac8507 100644
--- a/ui/tests/integration/components/clients/config-test.js
+++ b/ui/tests/integration/components/clients/config-test.js
@@ -18,7 +18,7 @@ module('Integration | Component | client count config', function (hooks) {
     this.router = this.owner.lookup('service:router');
     this.transitionStub = sinon.stub(this.router, 'transitionTo');
     const store = this.owner.lookup('service:store');
-    this.createModel = (enabled = 'enable', reporting_enabled = false, minimum_retention_months = 0) => {
+    this.createModel = (enabled = 'enable', reporting_enabled = false, minimum_retention_months = 24) => {
       store.pushPayload('clients/config', {
         modelName: 'clients/config',
         id: 'foo',
@@ -56,7 +56,7 @@ module('Integration | Component | client count config', function (hooks) {
 
     this.server.put('/sys/internal/counters/config', (schema, req) => {
       const { enabled, retention_months } = JSON.parse(req.requestBody);
-      const expected = { enabled: 'enable', retention_months: 5 };
+      const expected = { enabled: 'enable', retention_months: 24 };
       assert.deepEqual(expected, { enabled, retention_months }, 'Correct data sent in PUT request');
       return {};
     });
@@ -80,11 +80,11 @@ module('Integration | Component | client count config', function (hooks) {
     assert
       .dom('[data-test-inline-error-message]')
       .hasText(
-        'Retention period must be greater than or equal to 0.',
+        'Retention period must be greater than or equal to 24.',
         'Validation error shows for incorrect retention period'
       );
 
-    await fillIn('[data-test-input="retentionMonths"]', 5);
+    await fillIn('[data-test-input="retentionMonths"]', 24);
     await click('[data-test-clients-config-save]');
     assert.dom('.modal.is-active').exists('Modal renders');
     assert
@@ -154,7 +154,7 @@ module('Integration | Component | client count config', function (hooks) {
 
     this.server.put('/sys/internal/counters/config', (schema, req) => {
       const { enabled, retention_months } = JSON.parse(req.requestBody);
-      const expected = { enabled: 'enable', retention_months: 5 };
+      const expected = { enabled: 'enable', retention_months: 24 };
       assert.deepEqual(expected, { enabled, retention_months }, 'Correct data sent in PUT request');
       return {};
     });
@@ -165,8 +165,7 @@ module('Integration | Component | client count config', function (hooks) {
       <div id="modal-wormhole"></div>
       <Clients::Config @model={{this.model}} @mode="edit" />
     `);
-
-    await fillIn('[data-test-input="retentionMonths"]', 5);
+    await fillIn('[data-test-input="retentionMonths"]', 24);
     await click('[data-test-clients-config-save]');
   });
 });