Accessing "member accounts" of your AWS organization. Since the AWS documentation and all the write-ups are more complicated than useful, there's the cliff notes.

accessing child accounts in aws.md

Switching to Child Account in AWS

Prerequisites

Setting up a child accocunt:

• look at https://docs.aws.amazon.com/organizations/latest/userguide/orgs_manage_accounts_access.html#orgs_manage_accounts_create-cross-account-role
• you only need steps 1-9

Configuring switch roles

This needs to be done for every user and needs to be done for every machine (stored in a cookie or local storage).

Once you have switched from the parent account to a subaccount, your profile menu usually appears in the upper right corner will show the Display Name in a bubble colored with the chosen Color (below).

Note: you can switch back to the parent org by selecting Back to [ YOUR USERNAME ] in that same profile menu.

Preparation

• Click on your username in the upper right corner to access your profile menu (left most of the menus in that corner)
• Click on My Organization
• In the Organizational Structure chart copy the account numbers and names of the subaccounts you wish to access

For each subaccount you need access to follow these steps:

• Make sure you are in the parent account (there will not be a Back to [ YOUR USERNAME ] option in the profile menu).
• Open your profile menu by clicking on your username in the upper right corner (left most of the menus in that corner).
• Select Switch role
• If this is your first time doing this in the browser/computer you will need to click on Switch Role again
• Enter the account details
  • Account: (as copied in Preparation above)
  • Role: OrganizationAccountAccessRole
  • Display Name: user's choice - whatever makes sense to you
  • Color: user's choice - NOTE: this will be the color of your username in the header when you're logged into this subaccount
• Click Switch Role
• Note you are now in the child account, as indicated by the visual change of the profile menu button in the upper right corner.