Hello,
While installing the Dynamics 2016 server on-premise, I faced the issue "
"Microsoft.Crm.Setup.Server.GrantConfigDBDatabaseAccessAction failed. Windows NT user or group 'MYDOMAIN\SQLAccessGroup' not found. Check the name again."

[CAUSE]
There were two reasons for the issue:
- There was a remote session of the Database server (Server running SQL incessant) opened with the same user account that we were using to run the CRM Setup.
- SQL Management Studio was opened and logged in with the same user account running the CRM Setup.
[SOLUTION]
Close all the remote sessions. If not all, then at least the one from the same user account that is running the CRM Setup.
Close the SQL Server Management Studio sessions (If not all, then at least the one from the same user account that is running the CRM Setup).
Once the sessions are closed, click on Retry on the error dialog and it should work fine!
Hope this will help other as well.
:) Cheers!
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