Transfer Family Custom Identity provider Authentication using API Gateway Cross Account

Hello Danniel,

AWS Transfer Family doesn't support cross account IdentityProvider setups. Therefore, you would be unable to use an API_Gateway in Account B for a Transfer server in Account A. Further, this is true for Lambda_IDP and DirectoryServices_IDP authentication types as well. I would suggest you submit a Feature Request to Transfer Family team by reaching out via AWS Support.

-- Sagar