https://userapps.support.sap.com/sap/support/knowledge/en/3050424
3050424 - Error: URI: /fimapping/mappings/v1/filterdefinitions when completing setup wizard for...
You are connecting to Concur via middleware, and after completing the Setup wizard you receive an HTTP error 0, 500 or even 400 for the API...
https://api.drupal.org/api/drupal/core%21modules%21migrate%21src%21Plugin%21Discovery%21ProviderFilterDecorator.php/function/ProviderFilterDecorator%3A%3AfilterDefinitions/11.x
function ProviderFilterDecorator::filterDefinitions | Drupal API
functiondrupalapi
https://api.drupal.org/api/drupal/core%21modules%21migrate%21src%21Plugin%21Discovery%21ProviderFilterDecorator.php/function/ProviderFilterDecorator%3A%3AfilterDefinitions/8.9.x
function ProviderFilterDecorator::filterDefinitions | Drupal API
functiondrupalapi