When using an Automation Engine login and not SSO/SAML login (and you don't clear browser cache) the session color selected will remain consistent even across sessions for the same login.
Example: If you log in with client/id/department and set the session color to blue, the next time you log in with the same credentials the session color changes to blue on the login screen.
However, when using SSO/SAML and autologin, you can select the color at the login screen and click autologin, and it will work for that session. But the next login with the same user will default back to no color.
This is caused by a defect
This has been fixed with the AWI component in release 21.0.10. Please note that updating the AWI also requires that the utilities, intialdata, and Automation Engine are on the same service pack or service pack/hotfix where applicable.