Create Client Secret
To obtain client secrets for the registered account, perform the following steps:
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On the application account details page, select Certificates & secrets from the left panel.
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To get new client secret, click New client secret.
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Provide a description to describe your client secret, choose the expiration date you wish to set, and then click Add. The Client secret will then be listed in the Client Secrets section.

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The Client secret will then be listed in the Client Secrets section, copy the client secret Value, as it will only be visible and available to the user now.