Which permission do I need to edit the customer account UI?

I am trying to help a customer set up their customer account UI, but the permissions I requested aren’t allowing me to do it. I have permission to edit their theme and their store settings. When I get into the Theme Customizer and use the dropdown to go to checkout and customer accounts, it sends me to the store settings page and says I don’t have access. Which permissions do I need to do this?

There is a permission for Checkout and Customer Accounts:

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