Check the messages under Error List tab. If the message says "primary key is not defined" and "unable to infer primary key", make sure you have a primary key on the table. Simply, you may add ISNULL(ROW_NUMBER() OVER( ORDER BY ID), <value>) as PrimaryKey to your SQL View.
*Please make sure you click "Run custom tool"
Problem: Intellisense is not working for updated model or Updating model doesn't reflect in DB Context
Solution: Please make sure you click "Run custom tool
Problem : Duplicate rows in LINQ fetch via SQL View
Make sure your inferred primary key is really unique. Add ROW_NUMBER() OVER( ORDER BY ID) as PrimaryKey to your SQL View