Instead of each of your users having to remember another username and password to access the Data8 website, you can use Azure AD, your corporate AD FS server or other STS that supports WS-Federation to manage access.
This allows users to access the website securely without having to enter another username and password, and also gives you a single point of management (your internal user directory) to ensure that user accounts are disabled as required. Once a user is disabled in your directory they won't be able to log on to the Data8 website.
If you are using Azure AD there is no additional configuration for you to do. Just click the "Connect" button on the Federated Authentication Configuration page to get started.
If you are using AD FS you will need to first set up a Relying Party Trust on your AD FS server to allow it to issue tokens for the Data8 website.
AD FS is now configured, so you can now set up the Data8 website to trust the tokens issued by AD FS by going to the Federated Authentication Configuration page, entering the federation metadata URL of your AD FS server and clicking Update. This URL will be of the form https://sts.contoso.com/FederationMetadata/2007-06/FederationMetadata.xml, replacing sts.contoso.com with the full domain name of your AD FS server.