Need Help with DAX for Dynamic RLS to avoid bi-directional relationship

Hi all, 

I have to implement dynamic RLS on country where one user is allowed to see their own country data wheen user is not manager and if user is manager(IsManager=1)they should see all countries data means no RLS.

Please note that I shouldn't use bidrectional relationship in my data model so that role should be applied on country table that should filter FACT table.

Employee-Country table looks like below

| UserID | Email Address | Country    | IsManager |
|--------|---------------|------------|-----------|
| 1      | [email protected] | Finland    | 0         |
| 2      | [email protected] | Italy      | 0         |
| 3      | [email protected] | Spain      | 0         |
| 4      | [email protected] | Belgium    | 0         |
| 5      | [email protected] | AllCountry | 1         |
| 6      | [email protected] | AllCountry | 1         |
| 7      | [email protected] | Finland    | 0         |
| 8      | [email protected] | Belgium    | 0         |
| 9      | [email protected] | Finland    | 0          |

Country Table

| Country | CountryID |
|---------|-----------|
| Finland | 1         |
| Belgium | 2         |
| Italy   | 3         |
| Spain   | 4         |

Fact Table

| FactID | Country | Amount |
|--------|---------|--------|
| a      | Finland | 100    |
| b      | Italy   | 200    |
| c      | Spain   | 300    |
| d      | Belgium | 400    |
| e      | Belgium | 200    |
| f      | Italy   | 150    |
| g      | Spain   | 300    |
| h      | Spain   | 390    |
| i      | Belgium | 400    |

Data Model looks like

Employee Country and Country is Joined on Country column

Fact table is joined with Country on Country column

I am trying the below DAX in Country table but its not working when user is not manager 

IF(
LOOKUPVALUE('Employee-Country'[IsManager],'Employee-Country'[Email Address],USERPRINCIPALNAME())=1,
TRUE(),
MAX('Employee-Country'[Email Address])= USERPRINCIPALNAME())

Any help would be much appreciated

Thank you in advance!