@pavanshettyg5 

What version of Apache NiFi are you using?

The NiFi screenshot you shared implies authentication was successful, but you are having some form of authorization issue.  The second screenshot you shared from the logs is not providing much useful information.

What is observed in both the nifi-user.log and nifi-app.log when you attempt to access the NiFi UI?

You mention that you are using "OIDC provider".  So when you access NiFi are you getting to the login prompt where you provide your OIDC credentials?

What is seen in the logs at this time and when you submit your credentials?

Does your NiFi truststore contain the complete trust chain (all root and intermediate public certs used to sign the server certificate) for your OIDC endpoint?

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Thank you,
Matt