you can put the UCI and the sponsor name - but ONLY last name, no hyphen no first name etc. It will only tell you that the sponsor is approved, and file sent to VO.
Otherwise you can put the file number, (starting with F) and the applicant name - ONLY last name, DOB and place of birth.
then click on the "application received" and you might see that your file has been received in London, and medicals has been received... at least that what mine is showing. also some updates on addresses ( both for sponsor and applicants).
Congrats again!
Sweden