Answers for "Cannot insert duplicate key row in object 'dbo.AspNetUsers' with unique index 'UserNameIndex'. The duplicate key value is"

Cannot insert duplicate key in object 'dbo.Instructor'. The duplicate key value is (2).

DBCC CHECKIDENT ('TABLE_NAME_GOES_HERE', RESEED, ZZZZZ);

Cannot insert duplicate key in object 'dbo.Instructor'. The duplicate key value is (2).

DBCC CHECKIDENT ('TABLE_NAME_GOES_HERE', NORESEED);