PostgreSQL : permission denied to select from foreign table in security mode?

Question

facing issue of permission denied to select from foreign table in security mode ?

1. I TRIED TO ASSIGN USER SAME ROLE AS DBADMIN.
2. I tried to assign permission on given schema, table
3. granted permission on all schema/specific schema
4. granted permission on all tables/specific table

The user mapping between local user and foreign server user can be done with AK/PK ? or it is required to use with username and password only

Still getting similar errorrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr