In order to publish and maintain your White Label Mobile App, you need to provide Travefy access to your certificates in your AppStore Connect and Apple Developer Accounts.
1. When adding a NEW user to your AppStore Connect or Apple Developer Account.
Go to "Users & Access" and click the plus sign, which will open a modal / box to add information.
Be sure to set Travefy as an "Admin"
Be sure to check the box for "Certificate Access" (circled below)
2. When updating an EXISTING AppStore Connect or Apple Developer Account
Go to "People" tab / page in your account and click on the user you want to edit.
Then scroll down to "Developer Resources" and check the box for "Certificate Access" under "Developer Resources".