VCL styles for Hydra

I have Delphi 10.1 and am trying to get VCL styles to work in the Hydra samples, but keep getting the error "Style ‘’ not found’, where name is the style I want to set the application to use.

When I recreate the projects in Delphi 10.1, with the wizard, the new projects allow the styles to be loaded. I think it is probably a Delph 10.1 issue, as these initial projects are upgraded, rather than recreated. I’ll leave the question here as it might help someone else