You cannot log into a SQL Instance to run commands on the database (when locally on the DB system) because you are not a SQL administrator - but are a system administrator.
First seen in Enterprise ConsoleSafeGuard EnterpriseSafeGuard Easy
Assuming the user is an administrator on the system, this can either be because of:
To recover access to a SQL Server instance see the article below which details how to use Microsoft SQL Management Studio (SSMS) and the Microsoft tool 'PsExec'.
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