I'm working on a project, which integrates with some G Suite services, and is implemented using G Suite Marketplace SDK, so we can have it published on the GSM. We have unpublished versions of the app, which are used for testing.
Up until a few days ago, we were able to test the app, by going to Cloud Console at https://console.developers.google.com/, then to "G Suite Marketplace SDK", then to "Configuration", where we had a an "Integrate with Google" button. Earlier, this button had a "Test installation flow" label.
A few days ago, the button disappeared. No errors are shown. What I did notice as well, is that the Cloud Console UI changed as well (e.g. Configuration renamed to App Configuration, there's also a "Store listing" option etc.)
Does anyone have any idea about why the button might have disappeared?
I have filed a bug in Issue Tracker regarding this behaviour:
To anyone affected by this, I'd suggest clicking the star on the top-left of the referenced page, in order to keep track of its development and to prioritize it.
The disappearance of this button is caused by a change in Marketplace SDK UI, which also explains the other changes you noticed (e.g. App Configuration). This from Issue Tracker:
There as been an update in the UI, and the button
Integrate with Googlehas been removed from the new UI.
In any case, there are other ways to test add-ons before publishing them publicly (see here), including installing an unpublished one, deploying an Apps Script web app for testing or publishing the app privately so that it's only visible to users in your domain.
As a sidenote, recording a video of an app is no longer required for OAuth review when trying to publish it to the Marketplace (for which this button was useful).