I have an AWS managed Active Directory and I've setup AWS SSO for it. Now its time to add my SAML 2.0 applications.
We currently use 3 Atlassian products (and we also have Atlassian Access):
When I search for supported applications in AWS, I can see "Atlassian", "Confluence" and "Slack". What is the difference between "Atlassian" and "Slack" ?
Eg. See below screenshots from AWS Console:



Also, my Atlassian users have a different username to those in my active directory.
If I enable SSO, how will these 2 different user representations be "merged"?
Eg. in my AWS Managed Active Directory, I have user davidc. In Atlassian I have davico.
These 2 usernames are the same person.
How will SSO resolve these 2 users ? And which credentials will users use to login?
What happens to the existing MFA settings I have configured for my Atlassian products?
Last, I have IP whitelisting enabled. Will this affect my IP whitelisting in any way ?