AMD-Action:authenticate:SP error while trying to download Xcode 7.1

This helped me. In my case I had moved the local admin account to a different folder and then placed a symbolic link in /Users to link to an external volume and put everything back. It was an attempt to auto create users on an external volume. Everything worked fine except the Apps Store which expects the local admin to be in /Users/{NAME} and would not accept it anywhere else or you get these obscure errors. I recreated the user in this location and the problem went away. I did not see issues with the shared or guest accounts.

I've been getting the same thing for the last couple of days.

When I switched back to Yosemite I had to accept a new Mac App Store agreement (price changes for Apple TV) before I could download anything, after that I had no problem installing XCode 7.1.

Switching back to 10.11.1 and the error is still there, so I suspect there is something wrong with the ability to display the new agreement in EC, but just a guess. I've tried logging out and back into the Store, but could not get back in.

I had the same issue for a couple of days.

What I did to solve it:

- Open iTunes

- Go to Apps tab

- Click to download an app update (any app)

A page about the agreements, price changes, ... opened. I cas then able to accept it.

And I could download updates from Mac App Store (in AppStore application).

Thanks, but it didn't work for me. I got the app without the agreement, so that doesn't appear to be my issue.

That got me signed me back into my developer AppleID account, but I still can't log into MAS.

Same problem here, can't log into MAS, meaning no app update or new downloads.

Thanks but issue persist for me.. I can download app from iTunes App but Apple Store App is still troublesome.. :S

I can not update or download any APP (including free apps, Xcode or final version of El Capitan cause i am still on beta)

I have found that my problem was due to the fact that my /Users directory was on another physical drive (I have a HDD and a SSD in my macbook pro). Moving the /Users/Shared folder from my HDD to my (primary) SSD solved the problem.

Me too.. I kinda supposed that is the problem but could't resolve it. Actually I could update Xcode by making new login account but there is no trace of El Capitan final (10.11.1) update.. So i am with temporal solution, but no final X OS

I was having a similar issue.

After selecting Update or Update All in the Mac OS X App Store, and entering my correct Apple Id username and password, I get the following error:

An unexpected error occurred while signing in.

AMD-Action:authenticate:SP

I am using two-step verification with my Apple Id.

Turns out my problem was related to the location of the /Users/Shared/adi directory.

My /Users/Shared directory was a symbolic link to another volume, which, based on other research and looking at the App Store debug logs, appears to cause issues.

I removed the symlink, recreated the /Users/Shared directory on the boot volume, moved the adi directory from the other Volumes, and then recreated symlinks to the other directories I had in /Users/Shared. which resolved the App Store issue.

Hi bnixon67

I'm having the same problem: when I want to download updates from MAS I got the "AMD-Action:authenticate:SP" error.

I want to try your solutions, but I'm not that experienced, so please could you give some (a lot of) more detailled instructions how to do the "/Users/Shared" delete/move/copy thing?

I'm having 2 disks (one SSD "Macintosh HD", one HDD "Macintosh HD 2", the SSD contains MacOS, all Apps and a Symlink to the Users directory, the HDD contains all the rest (incl. users directories).

Looking forward to your explanations 😕

beatus

samric wrote:

Moving the /Users/Shared folder from my HDD to my (primary) SSD solved the problem.

Thanks, that was my problem, as well. Report filed with Apple.