Nintex Workflow Fails to Publish with Soap Error

Started getting the error below pop-up when attempting to publish Nintex Workflows in a SharePoint Server 2016 environment.

soap:ServerServer was unable to process request. ---> 
Failed to publish workflow: <Error><CompilerError Line="-1" Column="-1" Text="Type Nintex.Workflow.Activities.ReportingHeaderActivity is not marked as authorized in the application configuration file." />
<CompilerError Line="-1" Column="-1" Text="Type Nintex.Workflow.Activities.ReportingActivity is not marked as authorized in the application configuration file." />
<CompilerError Line="-1" Column="-1" Text="Type Nintex.Workflow.Activities.ReportingActivity is not marked as authorized in the application configuration file." />
<CompilerError Line="-1" Column="-1" Text="Type Nintex.Workflow.Activities.ReportingActivity is not marked as authorized in the application configuration file." />
<CompilerError Line="-1" Column="-1" Text="Type Nintex.Workflow.Activities.ReportingActivity is not marked as authorized in the application configuration file." />
<CompilerError Line="-1" Column="-1" Text="Type Nintex.Workflow.Activities.ReportingActivity is not marked as authorized in the application configuration file." />
<CompilerError Line="-1" Column="-1" Text="Type Nintex.Workflow.Activities.ReportingActivity is not marked as authorized in the application configuration file." />
<CompilerError Line="-1" Column="-1" Text="Type Nintex.Workflow.Activities.ReportingActivity is not marked as authorized in the application configuration file." />
<CompilerError Line="-1" Column="-1" Text="Type Nintex.Workflow.Activities.ContextDataActivity is not marked as authorized in the application configuration file." />
<CompilerError Line="-1" Column="-1" Text="Type Nintex.Workflow.Activities.ReportingActivity is not marked as authorized in the application configuration file." />
<CompilerError Line="-1" ...

Environment changes before this occurred was modifying the service topology for the SharePoint Web Service and SharePoint Workflow Timer Services.

This error looks very similar to the publishing error introduced by a Windows Server security patch in 2018, though is unrelated.

Resolution was to re-activate Nintex Workflow in Central Administration on all web applications required.

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