This issue can occur following a live to test has been processed. The details of your single sign-on configuration can be copied into the test system, which will not be compatible with your live single sign-on provider.
As a result, the connection is denied and you will receive this error message.
This issue can be resolved by the support team, so please contact support online if you experience this issue.
Error accessing test system: Invalid redirect_uri
Unable to access the test system after a live to test copy.
Written by Harry Ledger