I don’t know if you have a right to feedback.
But anything you got would simply be that another family were considered more suitable. They cannot tell you more without compromising the confidentiality of the other families involved and the child.
If there is a General issue that you can can act on then your Sw will tell you eg the panel were concerned about your lack of experience with children .
Lots of times you will be rejected for reasons you can’t change, eg where you live, having children already,
The placing agency and social worker get to decide who is at the meeting where this discussed. It’s not up to you or your worker.
It’s much like applying for a job. The employers hold all the cards. They get to decide who to interview and who is on the panel. They get to decide the criteria for hiring .
You may think you are the most qualified person in the world but you have no idea about the qualifications and experience of other applicants.
No one will give detailed feedback because of the risk of complaint or even litigation. It’s not in the company’s interest to do so.
I’m sorry you didn’t get the match you want. But you need to move on. If there is a general issue you can work on it eg high BMI, start saving to take more time off work