One possible fix for error ‘An invalid OAuth2 request was received’ while authenticating NAM using AA.

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The following error can be observed while authenticating NAM via AA with OAuth.

To resolve the error above, please do not define port number when configuring Redirect URIs of AA as shown below. This is applicable only if Identity Server is listening on standard SSL port which is 443.

Below is the snippet from the doc link about this requirement: https://www.microfocus.com/documentation/access-manager/5.0/nam_aa_integration_guide/nam_aa_integration_guide.html

 IMPORTANT: If your Identity Server base URL is on the standard SSL port 443, do not include the port number in the URI. For example, https://domain.example.com/nidp/oauth/nam/callback.

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