To add or change credentials for O365 ingest account, you must be logged in as the Local service account under which the Service (particularly the O365 module) is running.
The O365 ingest account requires the “Application Impersonation” permission.
Use the Credentials Editor for adding/changing the credentials for O365 ingest account.

The tool is called “QUADROtech.FlightDeck.Office365.CredentialsEditor.exe” and by default is located in: “C:\Program Files\QUADROtech\PST FlightDeck\Modules\Office365 Module”.

Run the tool, press the “Plus” button located in the top right corner for Exchange section and specify the valid UPN account and password. Press “OK” and save the credentials.
You don’t need to restart any service to apply the config change.

Setting up  OAuth credentials

PST Flight Deck can now be configured to use OAuth in order to authenticate with Microsoft Office 365.  The main steps of this approach can be found here.
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