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A unique identifier that is used by third parties when assuming roles in their customers' accounts. For each role that the third party can assume, they should instruct their customers to ensure the role's trust policy checks for the external ID that the third party generated. Each time the third party assumes the role, they should pass the customer's external ID. The external ID is useful in order to help third parties bind a role to the customer who created it. For more information about the external ID, see How to Use an External ID When Granting Access to Your AWS Resources to a Third Party ( in the IAM User Guide.

The format for this parameter, as described by its regex pattern, is a string of characters consisting of upper- and lower-case alphanumeric characters with no spaces. You can also include underscores or any of the following characters: =,.@:\/-

ExternalId is referenced in 3 repositories