Does anyone know if there are webhooks for the Modern SharePoint Online comments we can subscribe to?
We could not find anything useful yet and I suspect these webhooks don't exist, but I want to confirm that that's the case.
Closest thing that I see for comments on modern page is below API endpoint, which return all the comments on particular page (have tested)
Please see if you can subscribe to this endpoint or try subscribing to Library/ Page change and check if that triggers notification.
Unfortunately, it does not store comments in the SP list anymore :(
Reference article/ Discussion -