I have a paid individual Apple iTunes Connect account and one of my clients wants to upload the current iOS application developed to their Account. So they added me as a member of their iTunes account. I accepted the invitation but the team is not listed anywhere in my iTunes connect. What should be the issue? What should I do next to upload my currently developed app to their account with new certificates? Do I need to change Developer, Distribution and Provision certificates?
If you are added as Developer in itunes you can upload the app using that account. But in order to get the certificates you need to login to https://developer.apple.com/ and generate the certificate and provisioning profile. iTunes account is different from Developer account. Refer this https://clearbridgemobile.com/how-to-submit-an-app-to-the-app-store/