I know I am a few months late to the big Pokemon GO craze, but since I am a big Pokemon fan, I wanted to try it out. I'm a simple woman and I would just like to play Pokemon GO. However, I am having a strange issue creating an account.
At first, I was getting the "GPS signal not found" error, which I fixed by running Google Maps in the background. All seemed good and well until...
After I put in my birthday and try to log in with a Google account, it gives me a "Unable to authenticate" error after taking a long time to load. I'm connected to the Internet and all of my other apps work fine. I've tried reinstalling the app, removing and adding back permissions, and I've even tried creating a Trainer Club account and signing in with that, but the same issue occurs. My Trainer Club account is verified, so this is not the issue. I've also tried force stopping the app, but to no avail. I also have tried to use another e-mail by removing my original from my phone and adding an alternate, but I get the same error. Any ideas on how to solve this?
I'm playing on Samsung Galaxy S7 phone with version 6.0.1.
EDIT: I tried last night and I've checked the servers. They're fine, so I don't think that's the issue. Also, I'm pretty sure my phone isn't "rooted" since I have no idea what that means.
EDIT #2: I have also tried the "airplane" mode fix as described by Timmy Jim. I still get the same error.