aaApi_SelectProjectsByProp returns 0

I am trying to get the GUID of a Project from the name, as in

  SELECT [o_projguid]
  FROM [PWMS].[dbo].[dms_proj]
  where o_projectname = 'APP_000003 Brolejer'

which returns 'e717bb1f-9791-45cc-8630-5fc8728a2e0f'

But when using aaApi_SelectProjectsByProp to find a folder by name, the function always returns 0, even for names that I know exist.

so aaApi_SelectProjectsByProp(null, "APP_000003 Brolejer", null, null)  gives 0.

What am I missing here?