The addon has moved to using the “new” SAIC API.
If it doesn’t work you need to switch to using the legacy version of the integration from the add-on store.
For example, those of us in Australia apparently don’t have the new API yet. We need to use the legacy one for now.
edit: Nov 2024: Australia has now moved to iSmart 2.0 as well. The normal version of the addon now works.