This error message :
Cannot find the certificate 'AccountingCorp', because it does not exist or you do not have permission.
This Code
USE master
CREATE LOGIN Dave
FROM certificate AccountingCorp;
GO
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AccountingCorp was created with this code:
USE Frontier_equipment;
CREATE CERTIFICATE AccountingCorp
WITH SUBJECT = 'Frontier Accounting Records',
EXPIRY_DATE = '10/31/2009';