When I am signing into Gmail in my iOS App, I am getting the below error (screenshot) and the sign-in fields do not appear. We are loading the sign-in screen in a WKWebView.
I have read that google is deprecating webviews for OAuth and will block requests on April 20, 2017. As seen here in a Google Developers Blog: https://developers.googleblog.com/2016/08/modernizing-oauth-interactions-in-native-apps.html
Does this mean I already need to use or is there another viable solution? I thought I had more time before needing to update this.
My guess is that your client is registered incorrectly in Google Cloud Console. A 'WEB' client is typically a server or Javascript application. An iOS app should be registered as an iOS client.
https://developers.google.com/identity/protocols/OAuth2InstalledApp#creatingcred