Azure IDP being used to connect to https://sep.securitycloud.symantec.com/v2/home/dashboard returning error 400 Bad Request
If the access is no longer possible to ICDm you can workaround this by a direct access link to the portal:
Once connected remove the AZURE IDP integration from: Settings > Access and Authentication
Connect once again to the portal : https://sep.securitycloud.symantec.com/v2/landing
Integrate Azure IDP again, test the login the Error 400 should be cleared.
Note: sometimes you get a 400 Error, if you reload the page the access to the portal works, or open a new tab and attempt login to portal this will work as well.