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unable to add exchange account to the mail app on osx
A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.
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I have the same issue for the past two days and not able to add the account back.
The operation couldn’t be completed. (com.apple.accounts error 3.)
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(118.4, 68%, 21%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMT%3C/text%3E%3C/svg%3E)
I'm getting this error once the account authenticates but Mac OS Mail still cannot connect. Removed the account and attempted to add it back to no avail. Outlook for Mac still working. It started a couple days ago when Mac mail said "account offline."
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Hello everyone,
Thanks for sharing your concerns. To help us provide support more efficiently, please:Create a new thread on the forum describing your issue in detail.
Include your Outlook for Mac version and specify which license you are using.
This information will make it easier for our team to provide the appropriate support for your case.
Warm thanks.
what helped for me, even as EWS enabled for individual email, but not on organization level
Set-OrganizationConfig -EwsEnabled $true
Verify it flipped
Get-OrganizationConfig | fl EwsEnabled
You want:
EwsEnabled : True
wait 15-30 min, restart Mac and try to add account again
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You don't need to restart the Mac. After enabling Exchange Web Service EWS in the Org Settings, it does take a few hours to replicate across Microsoft for your tenant before you can go back into your Mac computer's Apple Mail application to add the Exchange email account again. But this change fixes and resolves this error!
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(198.4, 68%, 29%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMK%3C/text%3E%3C/svg%3E)
I sent this conversation to my IT department asking them if they had EWS enabled org wide. Turns out it was not, they enabled it, I waited 24 hours and then was able to add the exchange account.
Thank you to Kostya Afendikov
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Having the same problem here. Yesterday noticed an error icon next to my exchange account in apple mail. Deleted the account, rebooted and tried re-adding. Same error as everyone else is getting after confirming 2FA. Account is working as normal on iPad and iPhone.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(284.8, 74%, 37%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMG%3C/text%3E%3C/svg%3E)
I am having this same issue also! Please share any solutions.
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Same issue here, would be great to get a fix for this ASAP
thx!
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I am experiencing the same issue for the past four days. I am running macOS Sequoia 15.6.1, and the built-in Mail app can no longer add my Exchange account after completing two-factor authentication.
The error shown is:
“The operation couldn’t be completed. (com.apple.accounts error 3.)”
Important to note: I am using a Microsoft 365 F3 license, and this setup has always worked without any issues until now. Outlook on the web and on my iPhone still work normally — only the macOS Mail app is affected.
Things I already tried:
Since the failure occurs only on macOS Mail, it appears to be an issue with the latest macOS build and Exchange authentication.
Any assistance or official statement would be appreciated.
Thanks!
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Today, my Exchange Account stopped working in the Mail app on macOS 26.1 (25B78). I have tried to re-add it, but I am getting an error after successfully completing two-factor authentication. The web and iPhone clients work as usual. Please advise.
The operation couldn’t be completed. (com.apple.accounts error 3.)
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Started to having same issue, on Iphone it works just fine, it stopped syncrhonising my calendar, so I decided to re-add an account, and this started to happen
UPD
Thanks to @Hin-V , he provided screenshot from Microsoft acknowleding the info, and the next update from them was on Tuesday, November 25, 2025 at 4:30 AM GMT+7.
I just tried adding my account to Apple and it worked!