I have seen a lot of discussion on this, but nothing that seems helpful.
If the user has not given calendar permissions, or has declined permissions, in the initial access request, they need to go to the above page, to reset the permission.
However, I don't think that we are allowed to programmatically ask for this page.
Am I wrong?
There is no supported way to open that specific Settings page [1]. However, if you go to your app’s own Settings page then the Calendar switch shows up there as well. Your app can open its own settings using UIApplicationOpenURLOptionsKey.
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[1] Or any other Settings page for that matter. See this post.
Thanks!
That was what I needed.