Thanks for your reply.
Please see if the below screen shots give you a better idea:
On the left users are restricted to only certian regions, on the right user are restricted to only certian pages, in this case I am just blocking sales reps from seeing Financials.
So then on Power BI Service I have to groups
So now the problem is, if I apply "PageLevelSecurity", it works, and limits the user to the page, however, the RLS rules is ignored, and the user can still see all the regions, and not only the user specific regions. (pls note the above screenshot is just an example, both groups have user allocated).