Domain Mapping does not seem to be working?

I am trying to set up a small multi site network for 2 domains:
betyou.ie
betyou.uk

However, I keep getting sent to the Plesk Web Server's Default Page?

Any ideas what I may be doing wrong? I have followed the instructions completely but to no joy.

When I disable the mapping, I can access the site fine at: http://betyou.ie/uk/

Any help you can shed on this would be great!