RLS not working on Composite Models

Hello,

I am having an issue to enable RLS on composite models. 

The scenario is as follows:

1. I have a model X which I have enabled RLS and have published same Power BI Online

2. I created a Page on model X and I tested the RLS and it works fine

3. I created another model Y and I conected to Model X using Power BI datasets.

4. I built a dashboard using model Y and published same to Power BI online

5. On Power BI online I have set security on Model X i.e added the user id that can have access to the model using RLS

6. I tested the RLS using Model Y. However, I do not RLS working as it does seggregate the data as it should have done after applying RLS

Please bear in mind that at step 2 it worked when I created a dashboard directly on Model.

Is there anything I am doing wrong?

Thanks

Veemal