@vector_sec
The Splunk Add-On for Office 365 consists of a Tenant and Input page where you can do your Configuration.
So I think below link will work for you:
For tenant configuration: https ://[splunk hostname:port]/en-US/app/splunk_ta_o365/tenant
For Input Configuration: https ://[splunk hostname:port]/en-US/app/splunk_ta_o365/input
For logging and proxy settings: https: //[splunk hostname:port]/en-US/app/splunk_ta_o365/settings
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