iTunes Match error 4010 when adding songs to iCloud I have been using iTunes Match for 6 months or so and have been reasonably happy with the service. However over the past 2-3 days I get an error when I try to add new songs to iCloud:

We could not complete your iTunes Store request.
An unknown error occurred (4010).

There was an error in the iTunes Store. Please try again later.


I have restarted iTunes, rebooted my Mac but it made no difference.

Researching online shows lots of people going through all kinds of steps such as blowing away their whole iTunes library to fix this - often without success.  As this is not a new problem I am hoping someone will know the proper fix for it.

Thanks in advance.
So what worked for me was to sign out of iTunes Store then sign back in.  This will disable iTunes Match. You then need to turn Match back on. It looks like it is starting completely from scratch (!) but it doesn't and instead adds all songs to iCloud that were missing.

I had 3 albums to add and I had to go through this process for each one.  I am assuming that something has changed or gone wrong on Apple's server side for it to start behaving this way when it previously worked fine.