You just re-enabled IWA DSSO and notice it's not behaving as it should. What is an aspect you should keep in mind?
Solution: That when re-enabling IWA DDSO the Identity Provider (IDP) routing rules must be manually reactivated

There might be specific AD attributes, which - apart from others - do not appear in the Okta user profile. Can those extra attributes be mapped and provisioned towards an app?
Solution: Yes, if you map those attributes from AD to Okta and then Okta to App, as an example

When using Okta Expression Language, which of the following will have the output: okta.com Solution: String.substring("[email protected]", "@")

With agentless DSSO (Desktop Single Sign-on), you still have a need of deploying IWA Agents in your Active Directory domains to implement DSSO functionality.
Solution: The statement is false

In order for SAML to work, there is a need of an IDP and an SP and we know that already, but why is it so? Because:
Solution: An SP authorizes the users, while the IDP authenticates them