I believe a reservation is owned by one person and it can be either one of you. If you both have individual Celebrity accounts and you want to be the main owner, then try being the first one to log in and “claim” the reservation after it is booked And enter all information and make all selections with that log in.
As an alternative, clarify with your TA when you book the reservation.
I had an issue with Celebrity many years ago, because I have a Jr. at the end of my name. The booking engine and the Captain Club system handle the Jr. differently. To solve this issue I always book our reservation with my wife as the owner. Her name is on the reservation as the primary owner. I just enter all my contact information on her account and I never log into my account. It is her account, but I manage it.
It is possible that this bug has been fixed, but I do not want to risk it. I just stick with what works.
I know it it is odd, but you might want to try one of the two ideas.
Feel free to call me weird.