I am working on a Workflow for an SharePoint 2016 App, which was migrated to SharePoint Server 2019 in VS 2019. I am trying to access a class in the same solution from a SharePoint 2019 Workflow in an ExternalVariableValue activity but get the error 'type or namespace name does not exist in Namespace'. The class is part of the same solution as the Workflow and IntelliSense helps me find the member of the class I want to access but upon build I get an error:

Severity Code Description Project File Line Suppression State Suppression State Error The type or namespace name 'CurrentUICultureLCID' does not exist in the namespace 'Xx.XX' (are you missing an assembly reference?) Xx.XX

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