To provide better service and availability, we are upgrading our authentication protocol by replacing the URL redirector service. The replaced URL redirector service will be removed on March 31, 2020.
When you access your Common Data Service environment for the first time or every time after you have logged out from a prior session, you are directed to Azure AD for login. In the Sign-in page URL, it contains a set of internal values/codes that includes a link to the URL redirector service. Upon successful login, the URL Redirector service directs you to your Common Data Service environment.
The URL redirector service was replaced in September 2019. This change would impact you if you have created a bookmark of the login page before September 2019 that contained the link of the replaced URL Redirector service.
Some of the internal values/codes are time sensitive and are only valid for a short period of time. We recommend that you bookmark the Common Data Service environment page instead of the sign-in page.
Please note that only a small set of users are impacted by this change and the impacted users will see a notification page with instructions on how to correct the problem.