Microsoft Advertising adCenter is undergoing scheduled maintenance on the Microsoft Advertising adCenter API Sandbox environment from February 9 to February 11. UPDATE 2/16: Maintenance has been extended through Thursday, February 17th. During this time, you might experience intermittent issues while accessing the Sandbox environment.
While the Sandbox environment will not be available, the API Production environment will operate as usual and ads will continue to serve.
If you have any questions, please visit the API Forum