Subscriptions cannot be edited or new created

[jasimensonND]

All the existing subscriptions still work, however they cannot be edited. No new subscriptions can be setup.

Error from the log when trying to validate the subscription data query:

extensionfactory!ReportServer_0-1!1c08!01/07/2020-16:16:28:: e ERROR: Exception caught instantiating DAX report server extension: Microsoft.ReportingServices.Diagnostics.Utilities.ServerConfigurationErrorException: The report server has encountered a configuration error. ---> System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.ReportingServices.Cloud.DataExtensions' or one of its dependencies. The system cannot find the file specified..