Apple has disabled old GC user id's in the past.... Linking to an android device might be prudent.
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The core of why we recommend against updating is because we are getting reports, and seeing from our side, cases where upgrading causes issues. It is working for some people, but it is a risk to do the upgrade currently if you don't have a backup device. Developers are currently investigating and making sure that account linking works properly in all cases on iOS 10 is a top priority.
But why were the developers not working on this when the betas of ios 10 were available for them to test and work on a fix?
You assume this just occured to them after iOS 10 was released?
Of course, they've been preparing for iOS 10's release.
Beta is not the final version. As he said, some devices work, some don't, and their top priority right now is to get everything working properly with iOS 10.
Btw, even Apple had issues with their own iOS release. Google it.
I don't think anyone needs to google Gree's track record. You actually are giving Apple a compliment, if you have to google to find a problem you know there isn't a lot. I wish gree had that kind of track record.
On another note I do thank gree for communicating the issue.
I do appreciate the improved communications from Aurelius!
Even if the response is something I do not like or agree with, it is better than the very late responses or we just ignore you and never respond like before.
Dammit. Didn'come here first to read this thread. Updated to ios10 on iphone 6s and ipad air1. Now have no access to 3 accounts i had linked via Game Center (to accounts on older devices that haven't been able to load MW for years). Guess this is the end of my run w MW (on all except 2 accounts). Thank you MW and the app store for making my life more simple now. With only 2 accts i will have a lot of time to spend money/time on real life and othergamesnow;)
I believe part of the issue is that those of us with really old accounts who also have very old Apple accounts are the most likely to get problems. Why I suggested linking to another device such as an Android Tablet or Bluestacks.
This happened before when Apple changed the login requirements for Apple accounts, prior to a this if you had an old account the user ID was not required to be an email. When Apple switched to requiring an email address for GC accounts this broke a lot of things not the least of which was linking in MW. This did eventually get fixed but it seems to me it took nearly a month and I am not sure if it can even be fixed this time.
So if you are thinking of upgrading to IOS 10 I would strongly suggest backing up your device first in case you need to do a complete restore, plus if possible link to an Android device as a fail safe. If you have an old Apple GC account or Apple account in general you stand a pretty good chance that things are going to be bad.
For those posting that they did not have issues, I think you need to be a lot more specific. Are you using a new or old GC log in, do you even have linked accounts and could these have been on the old system? Just posting that it 'worked' could really screw someone else up completely.
my account is 3 years old with new login id, i have multi accounts and linked to a driod. I didn't have access to my other accounts after new update until i went in settings and logged in to game center. now my game seams to be working fine