In the AWS Single-Account Access page, on the left menu, select Single sign on
Select SAML
In the Set up Single Sign-On with SAML section
Section Basic SAML Configuration, select Edit
Section Basic SAML Configuration
Identifier (Entity ID), add #2 to the link to make sure this SAML login link is unique. Because I already have a SAML in my account, I have to edit the link here.
Select Save to save the information
You download Federation Metadata XML, you will use this XML file to upload to AWS to connect.