Hello SRIKANTH V.L,
Thanks for your question
This error indicates that access to Entra has been blocked by a conditional access policy.
To get the specific reason why this is happening, I recommend using the sign-in logs.
- Sign in to the Microsoft Entra admin center as at least a Conditional Access Administrator.
- Go to users and select the specific user with an issue, and navigate to the sign in logs pane. Click the sign-in log in question
- Navigate to the conditional access pane and you will see policies applied
You can further troubleshoot using: Troubleshooting sign-in problems with Conditional Access
You can mark it 'Accept Answer' and 'Upvote' if this helped you
Regards,
Abiola