Configure Allow public client flows in Azure
For MS Graph with Resource Owner Password Credentials, do the following to configure Allow public client flows in Microsoft Azure Active Directory:
If Allow public client flows is set to YES, then do not specify the Client secret. Else, specify the Client secret.
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Login to https://portal.azure.com/.
Ensure that you have necessary permissions to change the application settings.
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Click the View button for Manage Azure Active Directory.
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From the Manage menu, click App registrations.
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In the right pane, select the application you have created in Azure Active Directory.
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From the Manage menu, click Authentication.
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Under Advanced settings in the right pane, set the value of Allow public client flows to Yes.
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Click Save.