Unable to publish RemoteApp

Hi Everyone, I am currently running into an issue with publishing a RemoteApp from WVD (Spring 2020) host pool. I have tried adding it as a Start menu application, File path, and through the portal and powershell. Each time I get the error "Error: The filePath property does not contain a well-formed RDSH file path"

The application is installed on a network path "\\server\application.exe" and requires some cmd parameters to run properly which I have added but still receive the same error.  

Any assistance or guidance would be greatly appreciated!