Starting with the release of Strategy ONE (March 2024), dossiers are also known as dashboards.
Upon the release of Strategy 2020, SurveyGizmo will be a supported as a Community Connector. However, if you connect to a Strategy 2019 Intelligence Server while using a 2020 RC version of Workstation, you will see an option to use SurveyGizmo as a data source. When you click on the data source, the following error message appears:
This application has no explicit mapping for /error, so you are seeing this as a fallback.

The option to use SurveyGizmo is appearing because the Workstation version 2020, which supports SurveyGizmo as a data source. However, connecting with a 2019 Update 3 Intelligence Server, a version where SurveyGizmo is not supported, will cause the error to appear.
To utilize SurveyGizmo as a data source, you must upgrade your Community Connectors Server to 2020.