Querying a linked sql server -

I have added a linked server, which is showing in the linked server list, but when I ask it This throws an error in the name of the DB server

  EXEC sp_helpserver EXEC sp_addlinkedserver 'aa-db-dev01' Choose from the Open Query * ('AA-DB-dev01', 'TestDB.dbo.users Wrong syntax near 'aa-db-dev01' -   
 
 Message 102, level 15, state1, line 1 
 wrong syntax 
 <[table]  "post-lesson" itemsprop = "text"> 
  SELECT * to [server]. [Databases]. [Scheme]. [Table]  
 This works for me 




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