The Apple ID you entered couldn't be found or your password was incorrect.

This fix was posted by the user designbyday in another thread. Worked fine for me 🙂

This is desigbyday's fix:
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"Try the following - it worked for me..

Open iTunes. Clicked on Preferences and under Parental Controls disable access to the iTunes Store. Then checked the box to allow access to iTunes U.

Then try loading the store this time, it should send you directly to iTunes U with no problem.

Then go back into Preferences and enable access to everything and try
reloading the store. Good Luck
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Now I have access.

I have just encountered the exact same problem. I've been using iTunes for years without any problems and now I can't seem to log in at all. Initially I encountered the problem when trying to download some music - it let me log in and start downloading, but when the download finished the music wasn't there. I tried the "check for available downloads" in the "store" menu and it asked me to log in. When I tried I got the same error message "The Apple ID you entered..." I have restarted the computer, repaired permissions, logged out of iTunes and still the problem persists. Help!

This is still an issue and very counter-intuitive for what is supposed to be the most user friendly OS. I was trying to use Genius on my new iMac and initially it gave me the error "this person record requires harvesting" (what the hay is that supposed to mean to a user?). Then after I figured that one out (needed to add more info at myinfo.apple.com) I received this error.

I've been able to work around it again thanks to the information here but the root problem should really be fixed so people are directed to the correct places without having to search the internet for answers.

Here is my method in catalan and more accurated. May be it can help you:

http://apple.bloks.cat/iphone/problemes-per-fer-login-a-litunes/

Be aware to don't forget any step (specially to disconnect of any store on mac and on iphone and relog to the spanish store).

I published how to solve the problem here (if you are a catalan user):

http://discussions.apple.com/thread.jspa?messageID=11559203#11559203

I'm having the same problem. Never tried it before, I've read people had this happen before and it turned out their accounts were hijacked. :S

Same here. Glad I'm not the only one. I was starting to get frustrated, hopefully it's fixed very soon.

I am having the same issue. I can't update my apps. It says my AppleID is incorrect. Both in iTunes and on my iPhone. I have been using this ID and Password for years.

I can confirm that I am getting the same problem on my laptop, desktop and iphone. Seems the store is having a major issue! I hope my account hasn't been 'hijaked' 😟

Same problem with my account here... Major issue in iTunes Store then. maybe a big attack against the site?

Since yesterday I have exactly the same problem.

No solution yet.

I have the same problem. Iphone and Mac

Jordi, i'm a catalan user, and i tried the method you said, but it doesn't work on mi mac.

😟

I'm also a catalan user and I tried what you said, but still didn't work. It's strange, because I can log in in My ID and in this forum, but either iTunes or my iphone is working properly...