diff --git a/pkg/services/ngalert/remote/forked_alertmanager_test.go b/pkg/services/ngalert/remote/forked_alertmanager_test.go
index 278d38efaa0..80d40da3617 100644
--- a/pkg/services/ngalert/remote/forked_alertmanager_test.go
+++ b/pkg/services/ngalert/remote/forked_alertmanager_test.go
@@ -406,6 +406,26 @@ func TestForkedAlertmanager_ModeRemotePrimary(t *testing.T) {
 		require.NoError(tt, forked.SaveAndApplyDefaultConfig(ctx))
 	})
 
+	t.Run("SaveAndApplyConfig", func(tt *testing.T) {
+		// SaveAndApplyConfig should first be called on the remote Alertmanager
+		// and then on the internal one.
+		internal, remote, forked := genTestAlertmanagers(tt, modeRemotePrimary)
+		remoteCall := remote.EXPECT().SaveAndApplyConfig(ctx, mock.Anything).Return(nil).Once()
+		internal.EXPECT().SaveAndApplyConfig(ctx, mock.Anything).Return(nil).Once().NotBefore(remoteCall)
+		require.NoError(tt, forked.SaveAndApplyConfig(ctx, &apimodels.PostableUserConfig{}))
+
+		// If there's an error in the remote Alertmanager, it should be returned.
+		_, remote, forked = genTestAlertmanagers(tt, modeRemotePrimary)
+		remote.EXPECT().SaveAndApplyConfig(ctx, mock.Anything).Return(expErr).Once()
+		require.ErrorIs(tt, expErr, forked.SaveAndApplyConfig(ctx, &apimodels.PostableUserConfig{}))
+
+		// An error in the internal Alertmanager should not be returned.
+		internal, remote, forked = genTestAlertmanagers(tt, modeRemotePrimary)
+		remote.EXPECT().SaveAndApplyConfig(ctx, mock.Anything).Return(nil).Once()
+		internal.EXPECT().SaveAndApplyConfig(ctx, mock.Anything).Return(expErr).Once()
+		require.NoError(tt, forked.SaveAndApplyConfig(ctx, &apimodels.PostableUserConfig{}))
+	})
+
 	t.Run("GetStatus", func(tt *testing.T) {
 		// We care about the status of the remote Alertmanager.
 		_, remote, forked := genTestAlertmanagers(tt, modeRemotePrimary)
diff --git a/pkg/services/ngalert/remote/remote_primary_forked_alertmanager.go b/pkg/services/ngalert/remote/remote_primary_forked_alertmanager.go
index 1a360e4f513..8c2068e8179 100644
--- a/pkg/services/ngalert/remote/remote_primary_forked_alertmanager.go
+++ b/pkg/services/ngalert/remote/remote_primary_forked_alertmanager.go
@@ -34,12 +34,23 @@ func (fam *RemotePrimaryForkedAlertmanager) ApplyConfig(ctx context.Context, con
 	}
 
 	if err := fam.internal.ApplyConfig(ctx, config); err != nil {
+		// An error in the internal Alertmanager shouldn't make the whole operation fail.
+		// We're replicating writes in the internal Alertmanager just for comparing and in case we need to roll back.
 		fam.log.Error("Error applying config to the internal Alertmanager", "err", err)
 	}
 	return nil
 }
 
 func (fam *RemotePrimaryForkedAlertmanager) SaveAndApplyConfig(ctx context.Context, config *apimodels.PostableUserConfig) error {
+	if err := fam.remote.SaveAndApplyConfig(ctx, config); err != nil {
+		return err
+	}
+
+	if err := fam.internal.SaveAndApplyConfig(ctx, config); err != nil {
+		// An error in the internal Alertmanager shouldn't make the whole operation fail.
+		// We're replicating writes in the internal Alertmanager just for comparing and in case we need to roll back.
+		fam.log.Error("Error applying config to the internal Alertmanager", "err", err)
+	}
 	return nil
 }
 
@@ -49,6 +60,8 @@ func (fam *RemotePrimaryForkedAlertmanager) SaveAndApplyDefaultConfig(ctx contex
 	}
 
 	if err := fam.internal.SaveAndApplyDefaultConfig(ctx); err != nil {
+		// An error in the internal Alertmanager shouldn't make the whole operation fail.
+		// We're replicating writes in the internal Alertmanager just for comparing and in case we need to roll back.
 		fam.log.Error("Error applying the default configuration to the internal Alertmanager", "err", err)
 	}
 	return nil