While following the steps described in KB 393590 - VMware Aria Operations for Networks authentication through vIDM you receive the error as follows:
An error occurred during OAuth2 operation. Please contact your administrator to resolve the issue.
{ "error": "invalid_request", "error_description": "Invalid client" }
NOTE: VCF Operations for Networks was formerly named Aria Operations for Networks (AON), and prior to that was named vRealize Network Insight (vRNI).
VCF Operations for Networks
If the "Client ID" is missed in the URL that is generated, this will be an expected result.
Follow the resolution steps in KB 393590 - VMware Aria Operations for Networks authentication through vIDM, making sure to first review the official documentation for configuring identity and access management at Configure VMware Identity Manager.
If you believe you have followed these instructions correctly and not missed any steps, skipped any steps, or done any steps which are not in the documentation, please open a support case with the VCF Operations for Networks team using the instructions at Creating and managing Broadcom support request (SR) cases