User permissions
For a user to see data in Insights, the user need sto have a role that has the permission "View insights" in the relevant legal entities.
Group consolidation
To do group consolidation, which means that you can see data for multiple legal entities with different base currencies in Insights, you need to define which of your legal entities has the currency code and exchange rates that should be used for the group consolidation. To enable this, set the parameter "Group reporting exchange rates" in the legal entity that has the currency code and exchange rates you want to use for consolidation. If you don't want to use one of your existing legal entities you can create a fictive "Group company" that has the sole purpose of having the exchange rates used for defining exchange rates for consolidation.