Follow the steps:
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Go to your Microsoft Azure AD B2C > App registration > Open your application & go to the Endpoints section.
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Copy the “Azure AD B2C OAuth 2.0 logout endpoint” from the metadata.
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Navigate to the miniOrange OAuth Client module configuration.
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Go to the Client Settings tab of your App Client configuration.
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Scroll down to the Logout Settings section.
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Enable the Single Logout checkbox.
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In the IdP Session Logout Endpoint URL field, add your provider’s logout URL, which you copied from the metadata
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In the Redirect URI Param Name of Identity Provider field, enter the parameter expected by the IdP (it depends on the IdP to IDP)
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Save the changes to ensure the settings are applied.