Customer found the "Mark as False Positive" and "Request Exception" button has been added to their Vulnerability Group record Form after upgrade to Rome.
but after click the submit in "Mark as False Positive" and "Request Exception" they had the error as attached.
Version which has the below feature in the Doc
This is happening because when you try to raise an exception request it checks if any user is part of the OOB Approver group.
Once any user is present in this group it will start working fine.
The customer needs to add approvers in the below OOB groups in order to use this feature.