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After upgrading to Appian 20.1 Hotfix Package A or later, the following symptoms occur:
The recent Appian hotfix release includes an update to improve security. In particular, a change has been made reference number AN-155298 so that the authorization header is now hidden when invoking web API calls. As this header is now hidden, any existing calls making use of this property will return error messages stating that the field is null or that the parameter is missing.
The change introduced by this hotfix is intentional and aims to improve security. In order to resolve related issues: