WordPress multisite not working

How can you have a site at http://angelcard.example.com/logmein? The address isn’t invalid.

For the other link you provided http://angelcard.com.au/logmein DNS does not resolve, at least from my connection. It also does not resolve from AWS in N. Virginia.

/usr/home/bill/> nslookup angelcard.com.au
Server:         216.92.61.41
Address:        216.92.61.41#53

** server can't find angelcard.com.au: NXDOMAIN

Were DNS records recently created for angelcard.com.au? Maybe there just hasn’t been enough time for DNS to propagate.

Since it works from your PC I wonder if you have a local hosts file entry?

Check the result of nslookup on your PC and you client’s PC