Hi Steven,
We are having the same issue... We have SAML enable on SAP system but when we try to hit Fiori Launchpad... it is prompting for the SAP ID and password...
In which SICF we have to change the setting to Alternate logon Procedure...
Can you please provide me the SICF path...
Can you pls also send me details of your dispatcher... you can change the hostname for your web dispatcher...
Regards,
Kalpesh Mehta