Welcome! This forum has a treasure trove of great info – Scouters helping Scouters! Just a heads up, though - all content, information, and opinions shared on this forum are those of the author, not the BSA.
It looks like you are already connected to your younger child in Scoutbook. A Pack Admin should be able to update your connection type to her as “Parent / Guardian”. They can do this by going to her [Scout]'s Connections page in Scoutbook, click on your name, then update the connection type.
I would recommend that you contact your local council and ask them to use their Registrar Tools to look up both of your children. In the Relationships" section, your should be listed there as a parent under your primary BSA member ID number: 13989383. They should remove you as parent under any other BSA member numbers.