I am trying to add a gmail account to my iPad in order to have contacts, email, and calendar sync. I go to Settings -> Mail -> Accounts -> Add Account and enter my gmail credentials. It accepts the credentials and then goes to this screen:
The spinner to the left of Gmail will spin for about 20 seconds then it just takes me back to this screen:
The account never gets added. I get an email on my phone that says "new sign in from iPad" so I know the authentication is working.
I am using iOS 10.2.
The same problem existed in 10.0.2.
Some users have reported that doing this process over 4g rather than WiFi works, but this is a WiFi only device.
The gmail app is installed and logs me in just fine.
The same thing happens on both my 2 factor authentication account and my account without 2FA.
Best Answer
I had this problem too.
When I checked on google if there was a security issue (https://myaccount.google.com/device-activity) I noticed that my iphone location was overseas.
I then realised that iPhone was connected to my company wifi and was routed via their overseas hub.
So I disabled the wifi so that only the local mobile data was being used.
After that the add mail > google then worked.