Staging site created but can’t access wp-admin

Hi

I hope you can help. I have just created a new staging site and this says it has been done successfully but when I try to load it it takes forever to load the homepage and when trying to access wp-admin it loads the page not found part of my website and doesn’t have the orange banner at the top signalling that you are in the staging site

Any ideas?

The page I need help with: [log in to see the link]