FedEx Test Environment Service Disruption Scheduled for March 18, 2020
Incident Report for ShipEngine
FedEx Sandbox services have returned to normal.

We will continue to monitor the situation for any further issues.
Posted Mar 18, 2020 - 17:15 CDT
Please be advised of the following important service update from FedEx. Customers using FedEx Web Services will be unable to process certain transactions during this time period.

Note that this will only affect FedEx Sandbox accounts, and production FedEx is not impacted.

For more information, please refer to FedEx's page here:
Posted Mar 18, 2020 - 08:52 CDT
This incident affected: Shipping Carrier Sandbox Integrations (FedEx Sandbox).