Apple ID on El Capitan does not work at all

Hi! I found this post from 2015 and have read every message up until the end (july 2016). I am unfortunate to run into the same problem described by anonymoussir; however, sometimes I get the hang when I try to log into my apple account (say to download updates or sign into iTunes) or sometimes I get error messages (one was that I was not authorized to do that [i think i was trying to back up a device to iCloud through my macbook], another says "This action cannot be completed. Try again." [when trying to download updates]). I am ashamed to admit that before searching for solutions on the internet, I tried a few things myself (I am usually really good with electronics and with my apple products, although I am definitely more hardware, less software). I also have played around with different things before running into this problem (nothing that I believe created the problem as it just popped up out of no where a couple weeks ago).. I did not just update to El Capitan. I have been using it for a while (well, I went back and forth from yosemite a couple of times) and I use the handoff features quite a lot, as well as syncing photos, music, email, and I seem to be having issues with these now. I tried resetting PRAM, SMC, safe boot, creating a new user, single user mode, repairing permissions, my serial number is accounted for, and I even signed out of iCloud anonymoussir (this deleted the stuff from my mac but not from iCloud which I am able to get to on all of my other devices [ipad, iPhone, dads macbook air, and hopefully my "new" macbook pro 2012 that comes tomorrow] although not in that order! the macbook pro I am using now is a mid 2009 and is not able to update to sierra (sad panda). Anyway, I would like to solve this problem regardless and hopefully help any others who may still encounter it (hopefully no one will have to read this and I am the last one). I have not yet tried apenguins solution as I wanted to read through all the posts and see if anyone had experience the problem with the same details as me. I will report back when I have found a solution. (Seems that I may want to go back and retry some of the things that I have already, I will note the order in case it matters.)

Contact Apple directly for assistance with your Apple ID via phone support here.

You're absolutely right.

In my case it is not working in the App Store application for downloading updates. But the sign-in does work on this website, for example.

I had the same problem. I tried deleting files in Icoud/Accounts, restarted holding command, option, PR for 2 bongs, shut down machine, booted off another drive and ran disk tools... Even spoke to 2 different Apple reps. No dice. After they elevated and said an engineer would contact me in 48 hours (too long) I went old school.

I restarted my machine, holding down the shift key. Safe mode. Logged into itunes, icloud and messages with my apple ID... NO PROBLEM! Restarted my machine normally and Víola!

I had no issue on El Capitan instal. I do not use app specific passwords... That being said I do have the following, any of which I think could be the culprit.

Little Snitch

Kaspersky

Also I neglected to mention. Before I safe booted, I created a second user, with admin capabilities. When I logged in with that user, there was no issue with Apple ID. That lead me down the path of safe boot.

Good luck Sir.

I have much the same problem. I can sign in to iTunes and the app store from my iPhone 5 and my iPad Air 2. No problems. But I can't sign in from my 2010 iMac. I get the spinning gear, and I can't do anything else...I can't cancel, I can't quit. I have to use force quit. If I purposely put in the wrong ID or password, I get a dialog box telling me its wrong. So if it knows when its wrong, why in the name of the universe, unicorns, and magical rabbits can't it know when its correct?

I tried Safe Mode, but had the same trouble.

I've used disk doctor, disk utility, and have scanned for malware. I've rebooted so many times I can't count them.

So no music, no more apps. And if there is an update fixing this issue (I'm grateful its not just me), I won't be able to do it because I can't get into the app store.

UGH!!!

I think you misunderstood. When you create a new user in the computer, log out of your usual login screen, login as new admin user, then login to iCloud, iTunes and messages with your usual Apple ID... That will tell you if you are truly having an issue with your Apple ID sir.

Yes I was able to sign in with my Apple ID. This told me it was an issue with my user and not Apple ID.

I also with in a day or two of upgrading to El Capitan was locked out of my Macbook. My iPad and iPhone worked fine. I was able to reset my AppleID Password via my iPhone and then able to use my El Capitan Macbook Pro again. The one glitch that persists is that iTunes jumps up and down daily asking me to reenter the appleID into it.