Row Level Security

Hi . I have created an SSAS tabular model, have defined few roles and have allocated few members to those roles . I have used this model in Power BI to create few reports and have published them in my services . I have shared this dashboard with the members in my team(who have been allocated the roles). When they are trying to have a look at the dashboard few of them can see the correct data in the dashboard according to their role while other members are getting an error stating you cannot view this dashboard as role level security has been applied on it. PS: I have included those members in the roles in the tabular model.