Service buy back - am I too late?

Currently on my 2nd Mat leave.

My first mat leave was from sept 2021 to sept 2022. When I completed my paperwork I don’t remember ever completing any documentation stating I wanted to buy back my pension. Upon my return I wasn’t sure if I wanted to buy it back anymore due to finances.

I am on my second mat leave, completed the leave through people soft and still did not see anything pension buy back. My leave will be ending soon and I am interested in buying back my pension (both leaves). I thought I would just contact the pension centre to get things rolling.

I just saw/ read that the pension centre should send you a letter with how much and when the deadline to pay is.

I guess I was totally misinformed. I thought you could buy back whenever you wanted to.

Have I missed the boat? Can I still buy back my leave from sept 2021? Should I call pensions now to confirm I want to buy back my 2nd leave?