I keep getting error code 9n155 while sign in for MS365.

NKO 0 Reputation points
2025-01-22T16:06:27.1433333+00:00

Hi,

I am facing this issue for few weeks and unable to sign in MS365. I am using Mac 2024 with update software.

I get this message while sign in MS 365:

Correlation Id: 60442844-a2a7-4143-b80a-5e3001c84f34

Timestamp: 2025-01-22T15:51:52.000Z

DPTI: a90198b6dc681ca44aae0d8367a4ba5265f6f28fe816a295c28c106f9562842f

Error Tag: 9n155

Error Code: 0

I have tried all options mentioned in other thread including start in safe mode, re installl software etc.

Still cannot get rid of this issue.

I have not created another account as I will not be able to use my privilege with new account to sign in.

Thanks in anticipation

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2 answers

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  1. Jiajing Hua-MFST 14,420 Reputation points Microsoft Vendor
    2025-01-23T06:21:35.8133333+00:00

    Hi @NKO

    Welcome to the Q&A forum.

    It seems that you cannot sign into Office apps successfully, could you please log in to office.com for a check?

    Which type of account you are using, personally account or organizational account?

    If there is no problem logging in to the link above, I suggest you can delete Office related cache files:

    Open Finder.

    • Press Command + Shift + G, then type ~/Library/Containers/com.microsoft.office, and then press Enter.
    • Delete the contents of the folders related to Microsoft 365 (be careful not to delete other important files).

    Besides, clear your credentials:

    • Open Keychain Access.
    • Search for any entries related to Microsoft Office and delete them.
    • Restart your computer and try to sign in again.

    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.



  2. NKO 0 Reputation points
    2025-01-28T09:26:32.1866667+00:00

    Thanks for support.

    I have old sign in iphone and another mac and it is till working, but unable to sign in new mac I bought last week.

    I spoke to IT several times, but they are unable to sort it out and according to them no issue with account setting from organization.

    How to reset MFA as You mentioned earlier?

    Thanks


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