How to refresh expired google sign-in logins?
If the token is expired, you can call gapi.auth2.getAuthInstance().currentUser.get().reloadAuthResponse(). It returns a Promise.
google-plus-signin
idpiframe_initialization_failed in Google Sign In from Localhost
I was having this exact issue and this solution worked for me. In short: clear your browser cache. In Chrome: Settings → Privacy and security → Clear browsing data → Cached images and files