Tax free childcare

Does anyone know if you can get this while on maternity leave? Basically my 2 yr old has never been to nursery. I went back to work part time when he was 1 and my Mum has looked after him. I think nursery would be good for him so I want him to start a few mornings a week from January. I set up a government gateway account earlier and completed the application for tax free childcare and advised that I’m currently employed (which I am) but I noticed that one of the options was ‘on maternity leave’. I am due my second baby in December so I will be on maternity leave soon and I’m wondering whether that will mean we won’t qualify. Any ideas please? This is all new to me.