Apple Configurator 2 cannot sign in, error message displayed

[B4U]

This has started last night on my 2019 iMac running the latest available MacOS Sequoia 15.7.7.
When trying to sign in on Apple Configurator 2 version 2.20 (11B11), it gives an error message.
"The operation couldn’t be completed. (AMSErrorDomain error 100.)"

Tried searching online for the error message and did not find anything.
Anyone else encountered this before?

 

[bogdanw]

I see the same error on two Macs with Sequoia 15.7.7 and Apple Configurator 2.20

 

[B4U]

Sounds like Apple messed something up again then. 😅
Thank you for confirming. 😀

 

[KaliYoni]

When trying to sign in on Apple Configurator 2 version 2.20 (11B11), it gives an error message.
"The operation couldn’t be completed. (AMSErrorDomain error 100.)"

I've been having Apple Account login problems with AC2 as well on Macs running Ventura and Sequoia. I see different error messages though (something like "Sign-in failed"). I first encountered the problem about a month ago. The most recent occurrence was yesterday.

 

[bogdanw]

I started Apple Configurator, it returned an error about some download, but I appeared to be signed in. I signed out to see if Apple fixed the problem and now I can't sign in again 🙂

 

[B4U]

I started Apple Configurator, it returned an error about some download, but I appeared to be signed in. I signed out to see if Apple fixed the problem and now I can't sign in again 🙂

That is similar to what I was doing and got to this state too.
Already signed into the main account, signed out and sign in to sub account.
Password was correct but then got that AMSErrorDomain error pop-up.
Tried to sign in back to the main account, and encountered the same error pop-up. 😅

 

[B4U]

Tried an older machine with Big Sur and Configurator 2.15.1. It was already signed in, but cannot download anything.
Signed out, and tried to sign back in, got not authorized pop-up message.
This sounds like an expired certificate issue to me.

 

[bogdanw]

I got "Authentication failed" with 2.15.1 in Big Sur. The same 2.15.1 app moved into Sequoia returns the usual "The operation couldn’t be completed. (AMSErrorDomain error 100.)"
I've submitted a bug report at https://www.apple.com/feedback/configurator/ where version 2.20 is not yet in the list.

 

[B4U]

Okay, last resort workaround of a workaround.
On an old Windows 10 machine with iTunes 12.6.5.3, I am able to get the apps.
But that only works if I am downloading the app from the purchased page.
When I tried to update the apps already in the Mobile Application folder, iTunes throw an error saying those apps were not downloaded from my account and refused to update.
So, I had to remove those apps from the library and go to purchased in order to download the apps.
Hence, a workaround (iTunes) of a workaround (Configurator). 🤣

 

[nmt1900]

Apple Configurator 2.20 on Tahoe 26.5.1 and 26.5.2 gives same error. Seems to be widespread enough to rule out coincidence here...

 

[B4U]

Apple Configurator 2.20 on Tahoe 26.5.1 and 26.5.2 gives same error. Seems to be widespread enough to rule out coincidence here...

Thank you for helping to confirm!

 

[shponzo]

I'm having the same problem for two weeks now. Yesterday, I had contact with Apple support who looked together with me. They are going to send it to the right team. I will update here if I've any update!