Project Server 2016 upgrade error – "The project schema has not been provisioned in Content database"

Upgrade to Project Server 2016 environment fails with below error message.   Migrate-SPProjectDatabase : The project schema has not been provisioned in Content database '2013_ProjectWebApp'.     Use the Upgrade-SPContentDatabase command to upgrade the Content database and then retry the migration command At line:1 char:1 + Migrate-SPProjectDatabase + ~~~~~~~~~~~~~~~~~~~~~~~~~     + CategoryInfo          : InvalidArgument: (Microsoft.Offic…ProjectDatab   …

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