Pokemon Go login issues after update
Here's what I did that worked for me. Might not even need to do what I did...
- Iphone > Settings > Safari > Block Cookies > Always Allow
- Open Safari > Gmail.com > Logon with your gmail account > Open Pokemon Go
More information about this issue from niantic itself
I was having the same problem and the fix didn't help me either. But then I restarted my phone after resetting the cookies in settings and then logged into google in safari and then pokemon go, and then it seemed to work.