Hi Whitebison,
Hi WhiteBison, I belong to another forum, but decided to reply to your post as we had the same difficulty you are experiencing, we applied in June last year, Hubby the Sponsor, was able to log in using his details in August, after Receiving the Sponsorship Approval In July.
It turns out, we were not able to log in immediately partly because Ecas does not always work straight away, and also because we did not realise they had Hubby's Date of Birth in the wrong Format. (we had to play around with it)
so sometimes it takes a while before you can log in. which sucks ,cos really you should be able to open your file since they gave you a client number.
I would still say keep trying and make sure if you are logging in with Sponsor's details try the following:
Select Client ID: Enter "your" Client ID as shown on your Sponsorhip approval letter.
Name: Enter "your Surname" only
Date of Birth: If logging in with you Correct DATE OF BIRTH fails Try entering month for day and day for month.
01.02.1975 becomes 02.01.1975(this worked in our case, and turned out to be the reason we could not log in)
Country of Birth: Select the Country you were born from the drop down list
If this does not work now, just keep trying, they may not have updated Ecas yet.
Hope this helps