DWP Work Coach interview technical difficulties and linked vacancies

I have sat the work coach interview twice now and each time my interview failed to upload despite the application telling me that it had uploaded correctly. Has anyone else had this issue? Also I applied for two areas, and in the literature it states you will be interviewed only once for linked vacancies, so I interviewed once but then got a reject from the linked vacancy saying I hadn't competed the interview in time for that vacancy, but it stated interview scores would be transferred across all vacancies

I also did a work coach interview for two areas but I read you had to take separate SJT Tests and separate interviews, which I did. The questions were different on each as well.

In their literature on the website it states 'If successful at sift (which I was for both) you will be interviewed once only and the interview score applied to all adverts, that's why I'm confused...