Skillbuilder subscription does not show in AWS Console Billing

I subscribed to the Skillbuilder subscription ($29/month). Skillbuilder kept sending me emails that my subscription will invoiced, and I have an ability to view my invoice in the AWS account billing. But when I log into my AWS personal account (billing section) - I see no invoices for Skillbuilder subscription. Eventually my personal subscription ran out, and the bill left unpaid, and I have no access to the modules I was completing on paid plan.** It is possible to see what AWS account is linked to my Skillbuilder account and where the invoices are sent?** I am just a few steps away from finishing one of trainings and gaining certificate; I would like to cover the unpaid bill and keep my personal account functioning.