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Have I found.a bug? O365 TA reports incorrectly action


Hello All,

I've noticed what I believe to be a bug between the splunk_ta_o365. I wanted to point it out or see if I am missing something here.

I have many events in office o365 which looks similar to this (It is confusing, but this user did NOT login):

Raw Logs:

The "Splunk Add-on for Microsoft Office 365" the following lookup: "splunk_ta_o365_cim_authentication.csv"
which compares the Workload, Operation, and ResultStatus fields - it does not consider LogonError. It OUTPUTs the following new fields:


The splunk_ta_o365 includes:
tag=authentication for "dataset_name=authentication"

Now the Authentication.Successful_Authentication (looks for tag=authentication action="success") data model incorrectly tells you a user has logged in when in fact, they failed because there was "UserAccountNotFound"

Using Splunk 8+, Splunk_SA_CIM 4.15.0, splunk_ta_o365 2.0.1

Labels (1)

Splunk Employee
Splunk Employee

This issue has been addressed in the below bug:

ADDON-49247 - O365 CIM tagging not complete

Behaviour is addressed as below:
- Check if its Auth event or not
- If its auth event then we will check for the LogonError event field
- If we there is a Logon Error then action will be failure otherwise it will be Success
This fix should be included in the Splunk Add-on for Microsoft Office 365, 3.1.0 release which is targeted for End of April, 2022.
0 Karma

Splunk Employee
Splunk Employee

Hi @_joe , wanted to ask if you ever found a solution for this or were you able to find these successful or failed logins that Splunk reported in your O365 portal?

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