RLS Question with Group

Anonymous 

var _admin=DISTINCT('Admin'[Email])

Getting the list of admin emails and assign it to _admin variable

var _x = CALCULATETABLE(Division,Division[Email]=USERPRINCIPALNAME())

Filtering the Division table based on login user and assign that into _x variable

var _office = SELECTCOLUMNS(_x,"Office",[Sales Office])

Creating a new table called _office. It will contain a single column "Office" which is derived from _x table. ie login user's office.

var _group = SELECTCOLUMNS(_x,"Group",[Group])

Creating a new table called _group. It will contain a single column "Group" which is derived from _x table. ie login user's group.

var _OfficeManagerRole = AND([Sales Office] IN _office,[Spending Group]<>100)

Specifying a filter condition, Office Manager Role

var _ProdManagerRole = [Sales Office] IN _office

Specifying a filter condition, Product Manager Role

var _finalFilter =SWITCH(TRUE(), 
USERPRINCIPALNAME() IN _admin, TRUE(),
"Office Manager" IN _group, _OfficeManagerRole,
"Prod Manager" IN _group, _ProdManagerRole)
return _finalFilter

Deciding the user role based on the login user.