New Preview Beta Sandbox SSO Impact
With this change to the new Address https://companyname.preview.
If you are using a external application to Manage Single Sign On and they have a App configured for Workfront with an option to setup for Sandbox this App may no longer function.(Example - OKTA). This is because the APP may be configured to connect to the old sandbox URL https://companyname.attasksandbox.com and may not have an option to configure the Domain you are connecting to.
In these cases you will need to configure a new connection pointing to the correct URL.