I'm the author of an HubSpot app which is used to write leads from our app to the HubSpot Contacts (app id: 35904).
The app requests the "contacts" scope, and the "Basic OAuth functionnality" and "Contacts" scopes are checked in the app details.
Until now, it worked perfectly and it's still working fine for the existing integrations. But if we try to create a new integration (from a fresh portal), then we get the following:
I'm super admin on the portal.
Do you have an idea of what's going wrong?