Hello @ScottHansen__MDP_, I see the docs mention this: "Currently, most ArcGIS apps do not support updating items shared with a shared update group. To determine whether this capability is supported in a specific ArcGIS app, refer to its product documentation."
You might need to dive into the Esri docs to find the specific information per application. There doesn't seem to be one web page or PDF including so alltogether, or I haven't found it.
Update: I used the Esri Support AI Chatbot. It said (to be double-checked) that ArcGIS Experience Builder, Survey123, and ArcGIS Story Maps support shared update groups, but Web AppBuilder, ArcGIS Dashboards, and Instant Apps do not.
