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For FlexDeploy, you will want to create a new application unless you made one for this purpose. Only one is needed for incoming and outgoing mail.
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Populate OAuth Information
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Client Id
Client Secret
Optionally Private Key, for Client Credential Authentication
Tenant Id
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Click Save.
Authorize FlexDeploy
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If you are ready, click the Authorize button.
Connecting a FlexDeploy account to a Microsoft
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Application
Navigate to System Settings → Email Settings and use the page Configuring Graph OAuth - Microsoft Office 365 to configure it.
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