All the patients taking part in the UK womb transplant trial have MRKH - where women (adult human females) were born without a womb. Most women with MRKH have ovaries but no womb, although some women have neither.
I know two women with MRKH - one of whom has ovaries, one doesn't. Their vaginas weren't fully formed so both had to have surgery to create a full vagina to enable penetrative sex. They are females, of the class that produces ova and bears children - but suffer from a congenital defect that affects their ability to do one of both of these.
They've both spoken about their conditions publicly in the media to raise awareness of MRKH
Independent interview (Andreia):
I was born without a vagina or womb – and motherhood doesn’t define me as a woman
Grazia interview (Tasha):
The Story Of How One Girl's Scary Diagnosis Created An Inspiring Feminist Not-For-Profit
I believe those women taking part in the studies have ovaries and underwent IVF in exactly the same way as any other infertile woman (eggs retrieved and fertilised in vitro).
A PP mentioned the number of embryos wasted in these trials - IVF in general is more likely to fail than it is to succeed, and many cycles will fail due to uterine factors in women who have their own uterus (clotting disorders, uterine nk cells, endometriosis, fibroids, ashermans syndrome, uterine anomalies like a septum). My miscarriages were due to problems with my uterine lining, for example. I know couples who've had 11 miscarriages, or over 20 IVF cycles - so there are many many more embryos 'wasted' in the broader infertile population (of which I'm one). There's also many surplus frozen embryos which are donated to research, or discarded, so embryo 'wastage' is a much broader issue than womb transplantation trials. (For example - we have several embryos on ice, but my womb is now too damaged to sustain a pregnancy - in 8 years time at the end of the storage limit we will have to either donate the embryos to another couple, donate them to medical research or discard them.)