I get the message "com.apple.extensionKit.errorDomain error 15." on my MacBook Pro macOS Ventura when I try to access Internet Accounts.

I had the same problem. These steps solved it for me, completely.

1. Back up your data in an external hard disk. Complete. Simple copy-paste. Whatever's there.
2. Go to 'System Settings' > 'Transfer or Reset' > 'Erase All Content and Settings.
3. Follow the on-screen prompts, and completely reset your MacBook. This will permanently delete your personal data (hence, the backup in Step 1), and will make your MacBook, as if it was out of the box, completely new.
4. This should do it.

Again, make sure to simply backup your data in an external hard disk; a simple copy-paste.

Hope it helped. It did for me.

The "com.apple.extensionKit.errorDomain error 15" prevented me to update MacOs from 13.3.1 to 13.4 on a M1 Macbook Pro.

My remedy:

I just searched for "extensionkit" using the activity monitor and instantly killed the applications which utilized the "extensionkitservice". To be sure, I also killed any orphaned "extensionkitservice" process too. The MacOS could be updated successfully afterwards.

I had the same issue with my ethernet settings. However it could be solved as follows:

Go to settings -> network

click on the ... on the right below.

Add a service

Service Name: Ethernet 2

Interface: Ethernet

This will added as "not connected"

"Right" click on Ethernet

Select remove.

The new generated interface gets connected.

It is safe to rename the new interface back to Ethernet

Solved!

I have got this error:

title: "Erreur de réglages"

message: "L’opération n’a pas pu s’achever. (com.apple.extensionKit.errorDomain erreur 15.)"

after disable action on the switch:

Open "Réglages Système"-> Click on "Identifient Apple" -> Click the cell "iCloud" -> Scroll to bottom -> turn off the switch in "Accéder aux données iCloud sur le Web" cell

I got this error when trying to give permission to various apps in the Privacy and Security section of System Settings in Ventura. I tried all of the suggestions I could find here and elsewhere, but alas, none of them worked. What did finally work for me was to back up my boot disk to an external drive, reinstall Ventura and then migrate everything back from the external drive. Now it works like a charm. This was time-consuming, but my system is much cleaner and happier now.

In my case it was SonarQube, which is a quality assurance tool for computer programmers. It was running a Java process that began on startup, so rebooting was restarting both the computer and the pesky process.

I guess the suggestion I have is to check what's starting up when you start up. The process that started on startup was running a SonarQube daemon that restarted the process every time I killed it with "kill -9 xxxx".

From what I can tell from the comments, I'm not so sure it's the same thing causing it on all of our computers. That's why I said your mileage may vary, ha ha?

I gave up and wiped my machine and did a clean install/update. Everything seems to be working now.

Extreme solution, but seems to be a solution.

Hi ScOtRa00,

Well, re-installing from scratch, i.e., clean-install, and go some updates are often told a better way. The next best thing is use the help of TimeMachine's backup.

You know many application support files, and drivers had been cumulated over the years, and in most cases, you can not even find installers et al for the applications you have been counting on. So, in a sense above solutions can be an overkill.

You open System Settings -> General -> Information -> macOS pane -> rightmost lies an information mark with "i" in a circle. You can click on it. Then a dialog appears that gives you the choice between staying with the current version of macOS (with some updates installed) and getting rid of the last update that seems the culprit. It deed wonderfully worked on me. The problem is I am still facing hazardous malignant outside attacks that use the macOS' fatal flaw because you are now without the latest and greatest update unpatched.

my two cents.

HI

The problem I'm experiencing is related to the iMovie update, but I don't think it's the only application causing problems. To solve the problem, you can try adding a new service in the network settings by going to System Preferences > Network > Add Service (bottom right, click on the ...).

When you add the new service, be sure to remove any previous failed services.

This may help resolve network connection problems.

Got this error when I tried to add two iCloud accounts to the same Mac. Account 1 was created on the new (M2) Mac, and is an unpaid iCloud account. Account 2 was created a long time ago, probably on an iPhone in the 2010s, and is a paid iCloud account. I tried to add Account 2 to the Mac with Account 1. System Preferences → Internet Accounts definitely lets you add two accounts, but after adding, my System Preferences window because extremely slow/laggy. Navigating within the window yielded this error.

Then I figured this is probably a bad idea, so I tried to remove Account 2 with the Delete Account button, and it did not remove, just stayed there under multiple labels including "Inactive" and "Unknown". I clicked Delete Account several times, but Account 2 remained. Tried to restart my computer multiple times, still not removed. My profile picture associated with Account 2 also showed up on the log in screen, even though I theoretically removed it. Then I googled and found some answers on this forum saying that you "can't add two accounts to the same user account on the same Mac". Well... it turns out you certainly can, it will just brick iCloud. I tried Carky's solution, still no fix.

Now reinstalling the OS.

I am encountering the same error as you. It occurs when I follow these steps:

1. Go to System Settings > Internet Accounts.
2. Select iCloud from the list of accounts.
3. Navigate to the Apps Using iCloud and then click Show All.
4. Click on the back button.

Instead of returning to the list of Internet Accounts, I see an error message. However, this error does not happen if I skip any one step from the list above.

I am using an M1 Mac Mini with macOS 13.3.1. Curious what's causing this, and hoping that Apple releases a fix soon.

Success! go to network >> lower right corner of page to "...". then "add a new bridge."

Fixed, Whew!

I have this error too and it's preventing me from accessing my mail normally. It cropped up after I used Migration Assistant to migrate the data from my M1 MacMini to my older Intel MacBook Pro; both machines running Ventura 13.3.

A call to Apple Assistance earlier in the day to try and fix the problem was totally unproductive, although I hadn't seen the "ExtensionKit" error message at that point. The phone connection to the Apple advisor was bad, and after the line dropped she never called me back.

I'd really be grateful for help in fixing this problem.

I get this same error when…

System Settings ➙ Screen Time ➙ Always Allowed ➙ (Wait ~15 seconds for list of apps to appear) ➙ (Wait ~4 seconds) ➙ ExtensionKit.errorDomain error 15

I am unable to delete ANY contacts on my Mac (recently updated from macOS 12.6.4 to 13.3). It was suggested elsewhere that I should check for any restrictions in my Screen Time settings. Which I tried to do and received this ExtensionKit.errorDomain error 15.

Now it looks like I have two problems to resolve‼️